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SBRG group researching the tectonic base frequencies in Venezia Giulia, Italy

Tag: archaeoacoustics, archaeo-acoustics, low frequency, infrasound, transducers, Grotta Gigante, tectonic noise, geological fault, SBRG, SB Research Group 

After beginning the archaeoacoustic study of Bugomili’s Dolina and other archaeological sites in Venezia-Giulia (Italy), SBRG group needed a yardstick with which to compare the tectonic base noise in this area, with that of sacred sites in the region.

The Grotta Gigante cave is nestled deep in the Karsic area and located only a few kilometers away from Bugomili’s Dolina, making it an ideal candidate for this acoustic study. Its main cavern is the largest in Europe and second in the world (measuring 98,50 metres high,  76,30  metres wide and 167,60 metres long). Inside are a number of geological instruments (including a seismograph and geodetic pendulum) used to measure the tectonic plate (earth tides) on which lies this territory.

The study of the noises present in this area are not the only one reported for comparison to that recorded in  Bogumili’s Dolina (of which we have already reported here), but also to what is reported to the Mithraeum, one of the few still existing although violently destroyed in the fifth century AD, which is located nearby too we looked at recently, but for now that does not seem to be accompanied by a resonance phenomenon inside.


Fig. 1 – The remains of the ancient Mithraeum located in the vicinity of the mouth of Timavo river, famous for its long underground water course before ending in the sea


The Mithraeum is located in a cave overlooking the mouth of the Timavo river, possibly frequented since the Neolithic period. Which could explain why a Roman temple dedicated to the god Mithras, is there, as is the tradition of placing a temple in a natural cave near a source of water. This reaffirms the bond of the deity with the heavenly world, deduced from sacred images carved on two stones inside the Mithraeum.


Fig. 2 – Some of the stone plates inside the natural cave depicting the god Mithra photographed with an infrared camera


Back to Grotta Gigante (translation from Italian language: giant cave) in collaboration with the Julian Alpine Society (section of C.A.I, Club Alpino italiano) we obtained the authorization to place the microphones in the cave (outside visiting hours) to record any sounds present for a whole night. These files are still be analyised (about 12 hours).


Fig. 3 – The building for the reception of tourists at the entrance and the stairs leading to the cave


In the cave two huge geodetic pendulums are located in the center of the main chamber by the Institute of Geophysics of the University of Trieste. This measures the slope of the tectonic plate on which the Venezia Giulia area rests and there is a very sensitive seismograph that can record earthquakes thousands of miles away which is placed on the bottom of the same chamber.


Fig. 4 - The access to the main chamber with the huge pendulums which hangs from the top of the cavern until the ground


With the help of Fulvio Forti, the guide of Julian Alpine Society, the microphones were initially placed on the bottom of the cave, approximately 500 steps in a location away from water, but partially disturbed by the noise of the fans of seismograph placed at some distance.


Fig. 5 - The place where the microphones were placed in the bottom of the cave not far from the seismograph, locked in a small shack in cement


The results were however amazing. We recorded all night long until the cave was opened to the public in the morning. There was an incredible amount of noise recorded in the dark and silent environment. The sounds of breaking rocks from the rubbing of tectonic layers of hard rocks resulting from the phenomena of attraction of celestial bodies, the sun and the moon in particular, expressing the constant noise coming from the movements of the geological fault inside the cave. This owes its rise to a cataclysm that occurred about 12,000 years ago, the exact dating of which was determined by measuring the incremental lines of the growing stalactites that broke in the cataclysm.

Here is an example of a piece of original unaltered recording of less than a minute in mp3 format (the original recording has a significant size in 24 bit wav format) in which (ignoring the noise from the electronic fan cooling equipment of the seismograph) you can hear the cracking of the rocks that are moving, clearly distinguishable from the drops of falling water. We recommend listening to the file with a high fidelity headset.



Fig. 6 – A very evident fracture passes transversely through the entire thickness of the walls of the cave


 Fig. 7 - Part of the research team: on the left Fulvio Forti, guide of the Julian Alpine Society, and on the right our assistant / photographer, Chiara Chiandotto


At the end of August, we will take more measurements, placing the microphones in different locations. For now however, it does not appear that the low frequency sounds present in the sacred sites of the region are caused by the movement of underground water.



Fig. 8 – The graph of the data collected at the bottom of the cave. Low frequencies or infrasound are not present, only high frequencies from the noise of the drops, or the breaking of rocks in the fault line that runs through the cave transversely (the peak of ultrasound at around 70kHz is an effect due to the sensitivity of the microphones, but it is not real)


The range of grinding noise from the rock fracture within the geological fault, although surprising, do not look like the frequencies detected in other archaeological sacred sites previously studied by SBRG group.

Paolo Debertolis – August 2, 2014



We thank the Julian Alpine Society (Società Alpina delle Giulie) for their willingness to cooperate with this investigation, providing its facilities. A sincere thanks in particular to the Director of the Grotta Gigante, arch. Alessio Fabbricatore, and the guide Fulvio Forti.




Translated by Nina Earl


Archaeoacoustic research in Bogumili’s Dolina in the North-East of Italy

Tag: dolmen, menhir, dollina, Bogumili, archaeo-acoustics, archaeoacoustics, archaeology, SBRG, SB Research Group

In May 2014 SBRG began to examine a possible Neolithic site located on the Slovenia border called Dolina of Bogumili.

A “dolina” is a subsidence on the surface triggered by the collapse of an underground tunnel which has an underground river runnning through. It is caused by the process of "karstification", the chemical dissolution of calcareous rocks. The corrosion occurs by work of meteoric water that containins a certain amount of dissolved atmospheric carbon dioxide, when falling on the soil above ground CO2 is deposited.

This process creates the formation of long-distance underground tunnels, when they collapse they can sometimes create a sinkhole, a deep depression in the ground roughly circular in shape.

At Dolina of Bogumili, the depression in the ground has been used from time immemorial to build a type of amphitheater which features some superb acoustic characteristics. On one side at the bottom of the surface depression, there is a dolmen with a narrow entrance passage leading to a round chamber at the end which is covered by soil. In some aspects it has similar features to the Tombs of the Giants in Sardinia.

In the following pictures you can see the abandoned state of the amphitheatre, highlighted and circled in red is the entrance to the dolmen.



Fig. 1 - The Dolina of Bogumili: highlighted in red the entrance of the dolmen on the bottom of the depression


 Fig. 2 - The entrance to the dolmen. In the foreground the anthropologist Alessandro Severi who has previously collaborated with SBRG group in Bosnia and Herzegovina


Fig. 3 - The long, narrow corridor leading to the round chamber at the end. Everything is built with large dry stones and covered by earth


As you can see from above pictures, the structure was entirely built of dry stone, then covered with earth.

As in other sites we examined using our archaeoacoustic standard (SBSA), we used a shamanic drum (similar to an "Irish" Bodhrán drum) outside the megalithic structure then recorded the harmonics produced.

 Fig. 4 - We recorded the harmonics from a shamanic drum played in the site over the dolmen as the base line of the sound inside the depression of the surface (“dolina”)


We found that by positioning the shamanic drum at the entrance to the round chamber, it was possible to create resonance throughout the dolina with three specific frequencies which were different from the base frequency of the drum and its harmonics.

It is not known when this dolmen was built, but the menhirs scattered within the valley suggest a prehistoric period. The first traces of documentation dates back to 1600, oral tradition tells of the bugomilic heresy using it in the Middle Ages. Usually bugomili did not build these structures, as they made use of those structure already in existence. Some excavations carried in this site discovered shards of Roman dishes, so it can be assumed that the structure was in existence before the Middle Ages.

The images of some of the megalithic menhirs scattered within the dolina.

Fig. 5 - There are many menhirs scattered at different levels in the depression of soil


Some local historians have speculated this site was a Celtic tribunal with an audience sitting on the stands. This theory is hard to accept, if there was an audience, they would have had to stand up. In fact, the steps are too high to support sitting and if that happened, people would of had to tip their legs and with the sharp edge of the stones it would have been very comfortable. The appearance is clearly prehistoric, so its origin goes backdated respect the official dating, also because the archaeoacoustic characteristics found in this first investigation were common in several prehistoric temples we analyzed in previous missions in Europe.

This site presents an ongoing archaeoacoustic challenge for our research group. The volume and timbre of the drum changes substantially in the amphitheatre, when you turn on the resonance going to place the drum between the dome-shaped room, inside the dolmen, and the entry corridor. That is, the dome serves as a sound box and vibrates the entire amphitheatre when the drum is placed in the "node" of resonance. It was possible to detect this both graphically and directly by the microphones placed in or outside of the dolmen.


  Fig. 6 - The noise characteristics of the shamanic drum outside the dolmen. It’s clear a base frequency of 71Hz from which then departs its harmonics


 Fig. 7 - The Analysis of sound that propagates inside the dolina when the drum is played inside the room. The sound of the instrument is filtered and only three frequencies come outside, these correspond to the resonant frequencies of the rounded room in the central dolmen


Here you can find a sample sound file recorded in the valley during the experiment (about 17 per second you can feel the difference in the sound when you turn on the resonance).

This phenomenon is not to be considered by pure chance, the whole structure would seem to have a ritual function based on its acoustical effect.

As proof of what we have just said you can compare what we found in another room placed inside  the middle of the tiers of the amphitheatre. This room, well integrated into the overall complex of the amphitheater, though built with the same method of the dolmen, is totally devoid of sonic characteristics that make it a simple shelter, also equipped with louvers that illuminate the interior.


Fig. 8 - The second room present at a level higher than the side of the valley and steps (circled in red the entry). The photo is taken from the bottom of the surface depression (dolina)


 Fig. 9 - Detail of the entrance of the room-shelter


Fig. 10 - The loopholes in the room-shelter locations inside and outside. This room is completely devoid of sound properties


The dome chamber is situated centrally inside the dolmen at the end of a corridor, it is dark inside as there's is no natural light. It is similar in many respects to so called megalithic 'mound tombs', such as Newgrange in Ireland, all be it on a much smaller scale.


Fig. 11 - The long corridor of Newgrange, which leads to a central round chamber. Design by William Frederick Wakeman, 1900


Fig. 12 - For the evaluation of the sound characteristics of the round chamber, we placed the microphones both at the end of the long corridor inside the structure and at its entrance


Fig. 13 - For all other archaeoacoustic assessments the microphones were placed at the center of the sinkhole


Among other acoustic characteristics detected, there is also a low-frequency continuously detectable here and partly around the dolina. Probably this originates from underground movements of water, but justify the choice of ancient people for building a temple in this depression of soil, just like many other Neolithic temples we examined.
The archaeoacoustic research on this site will continue in the coming months.

Paolo Debertolis, Nina Earl – July 7, 2014




An anonymous quarrelling blogger

(Notice for the readers)


Tag: Irna, Le site d'Irna, Irna's blog, Irna, Simplicio, Eclisseforum, SBRG, SB Research Group

Usually we don’t waste time with what is written about us in the media, especially on forums or anonymous blogs. However, following the persistence of an anonymous blogger, we are obliged to officially reply to the attacks directed to our research group from the Internet. In this case we are speaking about Irna’s web site which claims to tell readers the truth about Bosnian Pyramids.

The readers should know that this anonymous blogger, Irna, gives the illusion of being an academic archaeologist. Although she graduated in geology, Irna has no academic assignment, experience of research or knowledge of archaeology, she is in fact merely a geography teacher at a school in Lyon (France). Her knowledge is obtained purely from the Internet, something recognised by the editor in the only journalistic report she published on the French review “Balkanologie” at the point n.4 of the “Texte intégrale” of the article (in French language “agrégée de Géographie” is teacher of geography at school).

Irna claims the reason for her anonymity is because she has received threats, but this anonymity covers completely her lacks. However her knowledge of Bosnia language and affairs is because she is of Bosnian origin.

The reason for all her attacks against our group of research (SBRG) is unclear, however more recently she promotes the sale of her e-book for €10.45 in which she argues the Bosnian pyramids are only a pseudo-archaeology affair.

SBRG group carried out research between 2010 to 2013 in Bosnia-Herzegovina with 18 missions. We published 2 papers here and here on international scientific literature and 28 news and 13 articles on our web site in English for describing our studies. Clearly our academic interest in the archaeoacoustic properties of this archaeological site in Bosnia were not well accepted by Irna.

We have also researched in other European countries, in particular England, Italy, Croatia, Malta, Serbia and Macedonia, but Irna has no interest in our research here. She is interested only in our Bosnian activity.

Because she cannot refute our academic titles, she began to discuss about the validity of archaeaoacoustic methods in archaeology, but after eight papers we published in the international literature since 2012 she can no longer support her claims, we have to remember she is not an archaeologist.

So Irna began to discuss who accepted our papers and in particular about the editor Thomson Ltd. of Žilina (Slovakia Republic) which organizes scientific conferences on the Internet and accepted 4 of our 8 papers on archaeoacoustics from 2012 (we have also published scientific papers on other arguments).

These conferences have three important peculiarities: firstly the editor after a peer-review mechanism of selection gives the possibility to the author that his work is easily found on the Internet by a simple search engine search, without having to spend a lot of money as with a traditional conference; secondly the number of citations of the author on Google Scholar is increased; thirdly the editor set in contact the authors of different fields for a multidisciplinary approach to science, giving the possibility to the participants to know the progress of other fields of research contiguous to theirs.

The success of this format is well demonstrated by the participation of a great number of authors and second or third editions of every virtual conferences reached at this moment. The last article produced by Irna attacks these conferences and at the same time reveals her low scientific knowledge and lack of understanding as to how the academic world works.

One only has to ask, what is real Irna’s motivation in discrediting all our research carried out in Bosnia?

SBRG – June 11, 2014


Update July 28, 2014 - Recently Irna’s blog trying again to have more visibility has re-published some links regard an anonymous Italian blog with a certain number of  articles full of falsehoods, foolishnesses and misconceptions about our research group and some members of it.

As we published here some months ago, the readers have to know that the anonymous author of these articles, signed with the pseudonym of Simplicio, was a young degree student of  Aerospace Engineering at the Polytechnic of Milan (Italy), whose initials are M.M.
At present we know this student has never received any training in the field of archeology, archaeoacoustics, acoustic or audiology. He has never participated in any archaeological excavation, he has never published any scientific paper or poster, he has never done any institutional research and has never been to Bosnia and Herzegovina, even though he has written about this extensively.
Therefore we leave it to you the readers opinion as to the scientific value, or even as documentary value the articles produced by this blogger (translated in French and English languages directly by Irna and by one of her collaborators, Abacus/Romulus), along with their level of their authoritativeness, claimed by the same anonymous author.

Irna’s attempt to claim authority using such ridiculous references is clearly non-professional, non-scientific and absurd again.




Archaeoacoustic mission to Macedonia for SBRG

TAG: archaeoacoustics, archaeo-acoustics, archeology, electromagnetic waves, ultrasound, infrasound, Macedonia, geoglyph, Sveti Nikole, Kanda, SBRG, SB Research Group

In March 2014 some members of SBRG (S. Mizdrak and H. Savolainen) participated to an archaeoacoustic mission to Macedonia for analyzing a geoglyph in the region of Sveti Nikole. This mission was organized by the Croatian historian Domagoj Nikolić and supported by Macedonian authorities.


Fig. 1 – The group of all researchers at work


The geoglyph is visible only by sky and is placed on a little hill (see the image below).


Fig. 2 – The geoglyph on the top of a little hill


This hill looks to be artificial as a tumulus and the composition of the soil is different from surrounding fields. 

This ancient tumulus seems to have some archaeoacoustic and physical properties. Thanks to the help of our members and their devices, in particular the new 3D sensors built in Demiurg laboratory which transform the radio wave signal into audio signal, these properties were analyzed very deeply.


Fig. 3 – The new 3D sensors by Demiurg


Fig. 4 – The equipment used for the study in Macedonia


Fig. 5 – The spectrum diagram of the electromagnetic beam at 41.6KHz recorded on the tumulus (click to enlarge)


These spectrum diagrams, you can see above, show the difference between Demiurg 3D-EM sensor data measured on the top of the geoglyph and on the location 300 mtrs away, so called "local baseline". Top data shown here is from the first spot of the triangular three EM measuring spots. Also stereo infrasound baseline data is presented. GPS data is not present in this.  


Fig. 6 - The signal at 41.6Khz (click to enlarge)


This mission was followed by Macedonian media in all aspects. All the data recorded on the tumulus were delivered to the Museum of Sveti Nikole for a deeper analysis and publication.  


Fig. 7. – An interview by Macedonian media to the protagonists of the research


Ultrasound, triangular comparison and binary analysis are in progress.

The preliminary results have been presented at the end of this mission in a lecture at the Faculty of Electrical Engineering and Information Technologies in Skopje by the researchers.

SBRG – May 19, 2014


You may listen the radio signal found on the top of the tumulus and transformed into audible signal by the devices of the research group here





Archaeoacoustic analysis using new TRV camera (Variable Resonance Camera) technology

TAG: archaeo-acoustics, archaeoacoustics, hypogeum, Cividale del Friuli, resonance, ultrasound, shamanic drum, TRV technology, SBRG, SB Research Group

SBRG research group recently begun a collaboration with researcher Daniele Gullà and Florentina Richeldi, to undertake a deeper analysis of previous results obtained using the latest TRV technology (Variable Resonance Camera). This technology was used for the first time in the hypogeum of Cividale del Friuli, to evaluate the resonance effect of some of the chambers located on two different levels.

The resonance characteristics of this hypogeum was established over several sessions during the research that began in early 2013 and later published in the international scientific literature with two peer-reviewed papers (here and here). The results seem to confirm the ritual origin of the conformation of the Hypogeum and not just as a storage of funerary urns, a hypothesis proposed and currently supported by some historians. In contrast, our hypothesis is that the underground structure is connected to a Mother Goddess cult, given the strong influence on the local population of the rites originating from Balkan immigrants since Neolithic times, recognized by historians. This could potentially backdate the construction of this ancient temple considerably.

Wanting to build on the studies carried out, we decided to conduct further research by monitoring the state of consciousness of people during ritual singing or chanting of mantras tuned to the resonance frequency of the chambers.

In the coming months, monitoring via an EEG (electroencephalograph) portable device in collaboration with the service of Neurophysiology of the General Hospital of Trieste will be undertaken as an extension of research in this field, which has already been published in the international literature (here).

Before proceeding with this however, we wanted to explore the altered states of consciousness that can be achieved through the resonance phenomenon sought by the builders of the hypogeum. For this reason, a collaboration with researchers Daniel Gullà and Florentina Richeldi, who have a wide experience in the use of TRV technology, was begun to test the level of consciousness of some volunteers using this new method of analysis. The results from this technique will be particularly useful to compare with what the EEG equipment that will be used in the coming months.

The “technology TRV” (Resonance Variable Camera) needs a little explaining in order to understand how it was applied in this experiment and how it might be applied within the archaeoacoustic field.

As a premise, it is important to know that there is a direct correlation between emotional and functional states of the human body with the precise parameters of controlled motion reflection. Until recent times quantitative parameters and efficient information of the movement of the human body were not established. Bernstein and Mira Lopez (psychodiagnostic miokinetics) studied the micro-mobility of the human body and found that it represented a sophisticated mathematical problem. For example, it has been shown that the vertical balance of the human head is controlled by the vestibular system, and they described it as a reflex function. But the balance of the human head controlled by the vestibular system can also be considered as an extension of locomotor activity (micro-mobility of the head). The analysis of micro-mobility of the head and of other types of reflexes which control the motility of the human body are able to provide a lot of information on the state of consciousness of the examined subject. From the physical point of view, the mechanical oscillations of the head are a vibrational process, whose parameters provide a quantitative correlation between energy and mobility of the object. Information on the integral parameters of mobility of the head can be obtained by using video analysis TRV (Variable Resonance Imaging Camera) technology, which provides quantitative information of the periodic movements of any part of the imaged object.

In the image provided on the primary monitor which are represented by pseudo-colours, each point represents the parameters of mobility in the frequency of the examined subject. As in other biomedical imaging (ultrasound, NMR, IR, X -ray), the TRV is a method of image analysis that is based on data of micro-mobility models and introduces a new term, emotional vestibular reflex or “reflection of vestibular energy” (REV) which indicates that the coordination of the movement depends on the emotional and physiological state of mind and that is affected by these factors.

To date, the system has been primarily been used in the security and anti-terrorism field. People in an abnormal state of mind (agitated or stressed) show a different color in the video image creating around them a kind of aura that can facilitate their identification in the middle of a group of people, for example in the hall of an airport.

The same principle is already used in medicine for the early diagnosis of certain diseases which imperceptibly alter the general state of the patient. The human vestibular system receives information from almost all districts of the physiological organism, from the cardiovascular system to body temperature. This information is used to support the physiological homeostasis of the human body, and any significant signal given by some diseases or emotional stress disturbs this equilibrium.

The software program connected to the TRV technology allows analysis of stress or other levels of biological parameters, which are important for regular monitoring of mental/emotional balance.

The algorithm of the stress equation includes different filters, settings and adjustments which can be configured within the system software. In particular by exploiting the perception of the system of micro-movements of the left and right part of the body and how its correlates to vibrations in the examined subject. A high level of stress in the subject corresponds to particular states ofasymmetrical vibrations in the body which are clearly detectable by the system and signaled to the operator.


 Fig. 1 - The TRV system used in the experiment


The TRV image analyzer system is used to monitor vibrations in normal or altered states of consciousness, the so-called Human Energy Field (Human Energetic Field - HEF). In a little square on the PC screen the image of the subject is shown using a spectrum of false colours, with a graph corresponding to the initial position. Later the software shows, through the variation of colors in the image, a transition to an altered state of consciousness, sometimes reaching up to the total disappearance of the image itself or to a change of colour to a single color tone. The change from the initial multicoloured to a single color state indicates that the vibrations are passed by a wide spectrum of frequencies to a narrow spectrum, indicating a situation of coherence of the examined subject.

In conclusion, we can say that the detected spectrum of frequency changes completely when the examined subject enters into an altered state of consciousness. All the parameters are analyzed and stored from moment to moment by the cameras software. At the end of the trial a "report" can be generated showing the spectrum of vibrations, that shows the depth of meditative state and the fluctuations of the intensity of the vibrations of the body of the examined subject. In the pictures below there is a distribution of horizontal colored stripes around the vibrating objects (rows represent obtained individual frequencies). They horizontally represent the spectral distribution of vibrations in a band between 0.1 and 10 Hz according to a scale of pseudo colors from purple to red (shown below).


 Fig. 2 - Images converted to a scale of pseudo colours in relation to the frequency in Hz


The vibrations generated in various parts of the human body normally vary continuously both in amplitude and in frequency. On the PC screen a large panel shows the image of the person and around him appear horizontal lines of various colours and lengths that are the result of the method applied to the vibrations detected. The vibration frequency is shown by the color of the line, according to the colour scale shown in the image above. Another panel in the bottom left of the PCs screen, shows three graphs of the spectral characteristics.

In conclusion, this whole method is therefore aimed at studying the functional state of the human body directed towards the recognition of the emotional state. The algorithms for determining the emotional state are based on a system of mathematical statistics, principles of coordination of movement, and the logic of behavioral psychology and comparative tests.

Back to the results of the experiment carried out on April 13th 2014, which was carried out in  chamber D of the hypogeum, located on the third level down after the central hall located on the first level for comparison to the chamber D, marked with the letter A on the map.

 Fig. 3 – Map of the Hypogeum of Cividale del Friuli


Two singers, one male and one female positioned themselves within chamber D to provide coverage of the entire frequency range. However, as noted in our previous research only the male voice was able to solicit the structure using a mantra chanted with monotone tuned to the chambers resonant frequency around 103Hz.

The audio recording control was performed according to the SBRG Standard for archaeoacoustics (here). In this case the equipment consisted of a high dynamic range recorder, extended both in the field of ultrasound and infrasound with a sampling frequency rate of 192 kHz (Tascam DR-680).
Condenser microphones with phantom power with such a wide dynamic range and flat response at different frequencies (Sennheiser MKH 3020, frequency response of 10Hz to 50,000 Hz) with shielded cables (XLR Mogami Gold Edition) and gold plated connectors were also used.

The microphones were placed on the other side of the chamber in respect of the singers position and mounted on two tripods (see Figure 5).

Given the small size of the chamber D, the recording volume was adjusted to a value of- 9dB in order to avoid recording distortions.

The camera used in this TRV system has a common CCD backlit, with a three MegaPixel sensor. The protective anti-aliasing filter was removed to extend the vision beyond visible light into the infrared (IR) and ultraviolet (UV) range. It has a system of rotating LEDs from infrared to visible which generates ultraviolet light and synchronises with the rotation of the light at will from 1 Hz to 10 KHz . There is a connection to a PC, but there is also the capability to save videos to internal flash memory. The lens is a 25 mm quartz-fluorite with passband about from 200nm to 1800nm


 Fig. 4 - The camera used in the experiment


The camera apparatus was placed at the same side of the microphones on a tripod, while the system software has been loaded on a laptop PC positioned at the side of the chamber.




 Fig. 5 – In the image the examined subjects placed in the nodes of resonance (location to get the best effect of resonance in the chamber) and the operator of TRV system on your computer


 Fig. 6 – The frequency graph recorded during the experiment. There is a high peak around 101-103Hz caused by the voice that is reinforced by the resonance phenomenon. The other harmonics of the voice are at a significantly a lower level


 Fig. 7 – The TRV camera was positioned on a tripod located on the other side of the room to the singers. It is visible LED generating IR and UV in front of it


At the beginning of the experiment the TRV system, placed in front of the examined subjects, reported a baseline normal situation in front of the camera.




 Fig. 8 – The basic aspect at the beginning of the experiment before intoning the mantra. In the foreground the female singer (a little part of the front), with the male singer in the background


After a few seconds from the beginning of the experiment there is a background noise between 2Hz and 7 Hz after the triggering the vocal resonance, which saturates the measurement of the environment.



 Fig. 9 – The background noise (2-7 Hz) after the resonance phenomenon begins (few minutes) which saturates the environment of chamber D


Subsequently, the frequency is lowered (0.1 Hz and 4Hz) signaling the balance and homogeneity of the entire body of the subjects positioned in chamber D. This has led to a gradual disappearance of the figure at the bottom of the chamber, with the figure closest to the camera (more easily detectable) started to become opaque.





 Fig. 10 – In these images is evident the progressive inability of the system to distinguish the figure at the bottom of the chamber from its surrounding environment, that is vibrating to a synchronous manner to the subjects concerned



 Fig. 11 – The homogeneity of vibration between 0.1 Hz and 4 Hz , present throughout the environment of chamber D, after a few minutes of stress by the resonance phenomenon, the figure disappears completely from the bottom of the chamber. So only the red marks of the reflectors on the jacket of the same subject remain which are evident only for the refractive effect of the same and the movement of the subject


So the software reported the transition to an altered state of consciousness, first veering to one shade of color, at which point the whole room began to vibrate at the same frequency as the subjects in question, until the image totally disappeared. The change to the single color indicates that the vibrations are passed by a wide spectrum of frequencies to a narrower spectrum, indicating a situation of coherence of all and towards a contemporary altered state of consciousness of the examined subjects, but also accompanied by vibration of the chamber that is tuned to the same frequency of vibration of the subjects under consideration. Which represents an unexpected result.

This altered state of consciousness was achieved by simply repeating a mantra for about 8 minutes, as documented by the audio recording.

The test carried out in a similar way to the chamber on the first level did not reveal any step contrary to altered states of consciousness.

In conclusion, the power of the rituals performed in ancient times in the chambers of the Hypogeum of Cividale del Friuli utilizing its resonance phenomenon triggered by a male voice (as shown here) or by means of a percussion instrument (here), is still today able to change the states of consciousness of those present. The objective findings observed by the RTV instrumentation represent something alredy detached from subjective perception of the people considered and variously reported by the protagonists of our previous research.

Ultimately the instrumentation used confirms that a "mystical" state can be reached after a few minutes by those who are subjected to the resonance phenomenon inside the chambers of the hypogeum.

Paolo Debertolis, Daniele Gullà, Florentina Richeldi – 16 aprile 2014


A sincere thank you from the SBRG research group to the owner of Cividale del Friuli Hypogeum, Mr. Gaetano Bront, for his helpfulness and kindness in allowing us to enter even at night his ancient monument for our experiments. Heartfelt thanks also to Mr. Federico Morandini, who patiently gave us the keys of the hypogeum to conduct our research. .A sincere thank you to Nina Earl, our scientific assistant, for her support in the drawing up of this paper.




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