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Concluding the experiment on Mount Rtanj in Serbia

TAG: pyramids, Rtanj, pyramid Rtanj, electromagnetic waves, ultrasounds, infrasounds, voice pyramid, SBRG, SB Research Group, Spirit Rtanj, Centro Studi cosmological Nikola Tesla, Demiurg, Zepter International Creative Group

After more than a week of work, the international team of scientists concluded the study of the energy beam coming out the top of the mountain and on the frequencies found in nearby sites.

The slopes of the peak of Siljak (1565m), the highest point of the mountain group, was really hard to climb with the large amount of equipment needed to carry out the experiment. For this purpose we had some horses which carried the generator to power tools along with the fuel to make it work.





 Fig. 1 - The difficult ascent to the summit of Mount Rtanj, Siljak


  Fig. 2 - The help of four horses, absolutely necessary for the transport of heavier equipment (photo Zepter International Group and Creative Media Agent)


The main experiment conducted by Slobodan Mizdrak, a physics researcher from Croatia (who had a careful preparation in this field in his military education), was to designed to send to the heart of Rtanj similar frequencies to those emitted naturally from the mountains (VLF radio waves).



 Fig. 2 - Slobodan Mizdrak (photo Zepter International Group and Creative Media Agent)


The answer from the mountain was not long in returning; the pyramid produced an increased response of static energy on the top, this acted like a signal amplifier and put the instruments which had been left on top of the peak for several days in a serious crisis!


 Fig. 3 - The ruins of the chapel located on the top of the mountain


  Fig. 4 - Slobodan Mizdrak working to set up the equipment placed close to the ruins of the chapel (photo Tatjana Sučec)


The experiment was followed in real time by researchers at a base camp, this was linked via radio with the instruments placed on the summit of the mountain.





 Fig. 5 - The best results for the collection of infrasound on top of Siljak were not collected on the summit where there was too much wind, but in the tunnel located just below the chapel



 Fig. 6 - The stunning aerial images of researchers at work collected by the team Zepter International Group Creative and Media Agent (Olivera Miladinović and Sandra Vojvodić) on behalf of National Geographic



 Fig. 7 - On the right, the main organizer of the experiment and the scientific meeting, Saša Nađfeji (photo Zepter International Group and Creative Media Agent)


The amount of data collected is huge and it will take several months for analysis at three research institutions that have agreed to collaborate with this experiment to analyze (Statistics Institute of Zagreb, Statistics Institute of Beograd, Institute for Advanced Mathematics of Vienna).



 Fig. 8 - The base camp full of computers which constantly kept tabs on what was happening on top of Mount Rtanj, remotely monitoring the equipment


The results obtained in other locations are equally interesting, such as the neighboring sacred temple dedicated to Cybele in the palace of the Roman emperor Gaius Galerius, the ancient church of Vidovanska and in the site of Svetilište, probably dating from the Neolithic period.



 Fig. 9 - The church located next to the ruins of the oldest chapel in the site of Vidovdanska, a place considered sacred from very long time and full of legends



  Fig. 10 - In the palace of Gaius Galerius (Felix Romuliana) is the temple dedicated to Cybele where we conducted the best acoustic surveys


It will take several months for the analysis of all sound files collected to be analyzed.


 Fig. 11 - Three of the four members of the SBRG who participated in the experiment in Serbia. From left: Slobodan Mizdrak, Paolo Debertolis, Heikki Savolainen (the fourth member, Nina Earl, took the photographs for SBRG)


Paolo Debertolis – August 14, 2013



Translated by Nina earl


An international team of researchers plans an experiment on Mount Rtanj

TAG: pyramids, Rtanj, pyramid Rtanj, electromagnetic waves, ultrasound, infrasounds, voice pyramid, SBRG, SB Research Group, Spirit Rtanj, Center Cosmological Studies Nikola Tesla, Demiurg

The main experiment, organized by "The Spirit of Rtanj" association, will begin on August 5th and continue for a some days. This event will be leaded by physics researcher Slobodan Mizdrak. All necessary tools and equipment will be placed on top of the mountain after four hours of walking to reach the summit. The equipment will be left in place on the summit, and connected to the base camp by radio remote control during the experiment, the base camp will be located in a hotel in the nearby valley.


Fig. 1 - Mount Rtanj seen from the near valley


Our working group (SBRG) will check for the presence of abnormal acoustic vibrations in the area around what locals know to be a "sacred" mountain. This archaeological district, has the remains of ancient Roman structures, but also the existence of prehistoric megaliths and there are many legends and myths that enrich the history of this mountain region.


Fig. 2 - We started the acoustic measurements


The purpose of our research here is to search for ultrasound, infrasound and low frequencies which may affect or alter the perception of the human organism. For ultrasonic detection, our research group is equipped with a very sophisticated compounderand integrated analyzer of ultrasonic frequencies (Pettersson Ultrasounds Detector D 1000X) as used by our sound engineer, Heikki Savolainen.


Fig. 3 - The ultrasonic analyzer Petterssonn


We started to analyise those places which were "sacred" according to local mythology and found the presence of an ultrasonic frequency of around 28.300Hz, this was in a prehistoric site on the east side of the plateau next to the mountain with the shape of a triangular base pyramid. in addition to detecting low frequencies in the same place in a range between 20 and 110Hz, the recordings carried out with digital equipment and high-sensitivity microphones confirmed this data.

The summit of the mountain group (Siljak) had in previous years demonstrated the presence of electromagnetic phenomena (VLF radio waves) at a frequency of 28.3 KHz.



 Fig. 4 - Our sound engineer Heikki Savolainen working together with other researchers in a Serbian sacred site


Fig. 5 - The same site as seen from the PIP camera (Polycontrast Interference Photography) three years ago, courtesy of prof. Ljubo Ristovski, a nuclear physicist, who had previously done this analysis. It is clear from the colors of the sky on the right the presence of energy coming out from the ground (electromagnetic waves)


Every night after dinner and following a day of intense work, the researchers made various presentations illustrating the status of their research to the large audience present at the meeting. The analytical work in this area will continue for the entire next week until Saturday August 10th.

Paolo Debertolis for the SBRG group - August 3, 2013


Translated by Nina Earl


The laboratory researches on systems for acoustic resonance in the ancient sites and related brain activity are going on at the University of Trieste

TAG: archaeoacoustics, underground structure, ancient temple, hypogeum, Cividale del Friuli, resonance, EEG, brain activity, SBRG, SB Research Group

We are continuing to research the archeoacoustic effects of resonance frequencies found in several ancient Neolithic sites on the human body, or rather how they affect brain activity.

We have begun the first phase of verification. In fact the equipment testing phase has now finished and we have begun an evaluation phase on volunteers, they are wired up to EEG whilst listening to audio frequencies between 90Hz and 120Hz. These frequencies are commonly found in the temples examined by Robert Jahn in the 1990s in Southern England and Ireland, but are also present in Neolithic underground structures as Hal Saflieni in Malta and the hypogeum of Cividale del Friuli in Italy.


Fig. 1 - The control desk placed close to the absorbing sound room


Like in the study by Ian Cook et al.  at the University of California, all of our volunteers were subjected to a "comfortable" volume in the absorbing sound room of the Otorhinolaryngology Clinic of the University of Trieste. This type of room is also protected by a fitted Faraday cage inside the walls to sheild from any possible external electromagnetic interferences that could affect the results.



Fig. 2 - A large number of electrodes was on the head of the volunteers


At the beginning of the test volunteers choose the volume of sound (from high-fidelity speakers) which was comfortable for them. The same subject remained in silence with closed eyes while the device recorded electroencephalographic their resting brain rhythm. The EEG equipment and technical cooperation necessary for the conduct of the examination was provided by the Department of Clinical Neurophysiology of the Neurological Clinic ot the University of Trieste.


Fig. 3 - The operators at work at the control desk during the experiment


After two minutes of silence to evaluate the resting brain rhythm, the volunteers were subjected to the tones of 90, 95, 100, 105, 110, 115, 120Hz arranged in a random way for one minute each. At the end of every cycle they listened to a mantra of the same frequency for a period of two minutes. This test was slightly different from the experiment of Cook, who used only 5 frequencies from 90 to 130Hz with 10Hz between without other types of sounds. The 130Hz was not used in our study because it was not found in any of the Neolithic temples we examined.

Of course, during the examination the door was closed and the volunteer remained alone in the room.


Fig. 4 - The computer tone generator (visible in the foreground) provided the necessary frequencies for the experiment


All the volunteers said the sound experience was "amazing." Even two operators from the research team wanted to take the test to subjectively evaluate the correctness of the procedure.


 Fig. 5 - Even two operators of the research team wanted to take the test


Much of the preparation time was used to place electrodes on a specific cap on the head of the volunteer under examination, this maneuver was carried out outside the acoustic room.


Fig. 6 - Preparatory work for the positioning of the headset with electrodes


Next month expert technicians will examine the EEGs for verifying the collected data. After we will move on to examine the same subjects in the underground structure that we are studying in Cividale del Friuli, subjecting them to the resonance frequencies present in it and theoretically making a comparative assessment.


Fig. 7 - The EEGs are no longer on chemical paper, but are digitally recorded and are saved in the form of computer files


The research will resume in September of this year.

Paolo Debertolis - July 25, 2013


A heartfelt thanks to all those who work for the success of this research project and in particular to the Director of the Department of Clinical Neurophysiology, dr. Fabrizio Monti, and the Director of Clinical Otorhinolaryngology, professor Giancarlo Tirelli, and to all the technical and medical staff. A sincere thanks to the Director of the Department of Medical Sciences, prof. Roberto Di Lenarda, for the support in our research.

Here is an example of tone used during the experiment at 110Hz, in this case with the duration of two minutes.



R.G. Jahn, et al.: "Acoustical Resonances of Assorted Ancient Structures" Technical Report no.95002 PEAR, Princeton University, March 1995

R.G. Jahn, P. Devereux, M. Ibison: "Acoustical Resonances of Assorted Ancient Structures" J. Acoust. Am Soc Vol.99 No.2, February 1996, pp.649-658

Cook, I. A.; Pajot, S. K.; Leuchter, A. F., Ancient Architectural Acoustic Resonance Patterns and Regional Brain Activity, Time and Mind, Volume 1, Number 1, March 2008 , pp. 95-104(10)



Systems of acoustic resonance in the ancient sites and related brain activity - Preliminary study

TAG: archaeoacoustics, hypogeum, Cividale del Friuli, resonance, EEG, brain activity, SBRG, SB Research Group


We are beginning a new study  in collaboration with the Otorhinolaryngology Clinic and the Neurophysiology Service of Trieste for the assessment of the effects of resonance phenomena on the human body. Such effects are found in several ancient sites, in particular in the Hypogeum of Cividale del Friuli and in Hal Saflieni in Malta.

We will work with volunteers who will undergo examination by EEG while listening to tones between 90Hz and 120Hz, similar to the resonant sounds present in some Neolithic structures in Europe (England, Ireland, Italy, Malta). The international standards for testing on human volunteers protocol will be adhered to.

The study will seek to deepen what has already been found at the University of California (UCLA) in its laboratories (Laboratory of Brain, Behavior, and Pharmacology) by Professors I. A. Cook, S. K. Pajot and A. F. Leuchter. We will also extend the research directly to the archaeological site of Cividale del Friuli.

For this purpose we will use as our laboratory the absorbing room in the
Otorhinolaryngology Clinic for audiometric tests, this has been suitably modified with suitable software and hardware.




Fig. 1 – The absorbing sound room which will be our laboratory


Fig. 2 – Researchers of the Otorhinolaryngology Clinic at work



Fig. 3 – An example of the study of a tone at 125 Hz The room does not appear disturbed by spurious frequencies coming from the outside, but there is only the peak of the sound emitted by the equipment


The absorbing soundroom has been examined to ensure ultrasonic or infrasonic frequencies are not being emitted from the rooms ventilation system, which could affect the results.

The research is estimated to take approximately six months.

SBRG - July 11, 2013


 Translated by Nina Earl


Preliminary results of our research in archaeoacoustics in Cividale del Friuli hypogeum, Italy


TAG: archaeoacoustics, hypogeum, Cividale, resonance, ultrasounds, infrasounds, SBRG, SB Research Group, Paolo Debertolis, Valter Maestra

After careful analysis on the recordings made in the last months, some members of SBRG have started a new season of acoustic analysis of the Cividale del Friuli hypogeum.

This consists of various underground spaces below the surface, carved out of the conglomerate with different levels and branches. Its shape looks very rough to a careless eye, but in reality despite the alterations over the centuries, the builders made full use of the shape of the rooms to take advantage of the resonance phenomenon, obtained during prayers mystic songs.


Fig. 1 - Map of the hypogeum of Cividale del Friuli


The underground could have been derived from a natural cavity along  the right rocky riverbank of the Natisone river. Aside from the fanciful interpretations mixed with legends, it was hypothesized that during the Celtic age, the Hypogeum was used as a depository for funerary urns, however other researchers believed it was used as a prison during the Roman or Lombard period.

On the other hand, there are three big and disturbing masks carved on its walls in the style of the Celtic tradition, similar to the remains of sculptures found in Celtic graves in France known as têtes coupées. So the niches carved out by other hands along the route are perfectly dry, possibly used at a later date as a mortuary. In respect of the other chambers they are wet so would have been unsuitable for use as a mortuary.

It is assumed that even some of the hypogeum rooms functioned as tanks with water and rites of uncertain origin. However, the true function and origin of this underground structure, which is unique in Friuli, remains a historic mystery. We can be certain that the underground had been remodeled in successive periods, however all the other hypotheses have not been supported by evidence.

The structure is represented by a central higher chamber, which is reached from the surface through a steep ladder that descends in depth. At the beginning of this ladder, you can find the only window that gives you the access to the riverbank of the  Natisone, the rest of the structure is totally underground. Three corridors depart from the central chamber, with niches and seats of various heights. Many niches appear to have been dug with a pick and refer to later periods.


Fig. 2 - The stairs leading to the central room (chamber A of the map)


The focus of our research group on this archaeological site was drawn from the theories about the function of this place by Valter Maestra, an independent researcher and historian of ancient civilizations. He drew a parallel with similar existing caves found in Peru, which were used to officiate rites of prayer to Mother Earth. According to this hypothesis, the hypogeum would have the same function as the caves found in Peru, with the aim of contacting the esoteric underworld.

The assumption seemed to us undoubtedly striking and, in parallel with research in archaeo-acoustics recently conducted in the South of England from SBRG. We are aware the resonance phenomenon has been detected in the Maltese underground temples by other researchers, so we wanted to test in the same way this structure.


Fig. 3 - Chamber B of Cividale del Friuli hypogeum has a different shape than C and D chambers. Therefore it is likely it was adjusted in subsequent periods or had another purpose


A few months after the beginning of the research, we have been able to detect the presence of the resonance effect in two chambers C and D (see map), these maintain the original form retaining an arched shape along the top. There is also a small truss on the end wall which seems to have been specially built to tune up the room for a male voice singing or praying.


Fig. 4 - The entrance to chamber C which seems to have retained the original shape and has demonstrated the presence of a conspicuous effect of resonance


Fig. 5 - The logarithmic plot of the effect of resonance in C chamber. The hump between 30KHz and 90KHz is due to increased sensitivity of the Sennheiser microphones at these frequencies, but there is not anomaly in this. No ultrasounds have been found in the Cividale hypogeum so far


The male voice is absolutely necessary to stimulate the resonance phenomenon as the two chambers are tuned to 94 and 102Hz. On several occasions we used a female voice, including a female mezzo-soprano voice however the resonance effect was not reached because below 150Hz it is wholly insufficient to stimulate the structure.


Fig. 6 - The recording devices placed at the entrance of the room C


Fig. 7 - The unilluminated bottom of  D chamber with highlighted in red microphones positioned for recording


Fig. 8 - Our collaborator, Dolores Dreosti, who sung using her mezzo-soprano voice for sound analysis of D chamber


The recordings were made with the usual archaeo-acoustics technical protocol of SBRG. Digital Recorder Tascam DR-680 programmed for a 192kHz sampling rate and Sennheiser MKH 3020 microphones, equipped with shielded cables Mogami Gold Edition XLR and gold-plated connectors.


 Fig. 9 - The extremely flat response of Sennheiser MKH 3020 microphones with a greater sensitivity in the field of ultrasounds


The experiment took place on various days over the last months and different singers were used to search for the right frequencies for the resonance phenomena. The tracks were examined with two programs for sound analysis: Praat program version 4.2.1 from the University of Toronto and Audacity open-source program version 2.0.2, both for Windows PC.


Fig. 10 - Top: the harmonious appearance of the graph from chamber D, with a male voice stimulating the resonance at 102Hz. Bottom: the detectable graph of D chamber when the voice is female. The dominant feature is around 198Hz, the hole in the low frequency range between 20Hz up to 200Hz is clearly shown in the graph


The resonance sound response is a range of sound that starts from infrasonic up to the frequency of 102Hz for D chamber or 94Hz for C chamber (the tuning by a male voice to create the resonant effect). This is particularly evident when comparing this graph with the graph of the female voice in which a hole appears in the same range of audible frequencies.


Fig. 11 - Chamber E located below the access ladder, had no resonant effect. It is possible this was dug in a later period as its shape is completely different from the other rooms


Fig. 12 - The researchers who participated in the experiment of May 14, 2013


We will publish as soon as possible the final results in an international scientific journal.

Paolo DebertolisMay 19, 2013


This is an original studio file collected in the hypogeum on 13th of May, 2013. It is recommended to listen ONLY through high-fidelity stereo headphones with a wide range of low frequencies, otherwise you can not hear just a little the resonance phenomenon. The file is not altered, but only compressed into .mp3 format because the original file in .wav format with 192kHz sampling rate has more than 200 Megabytes. This file takes about 2 minutes to listen in silence. To download the file (for personal use only and not for distribution) please click here.

A sincere thank you from the SBRG research group to the owners of Cividale del Friuli hypogeum for their helpfulness and kindness in yielding even at night their ancient  monument for our experiments. Heartfelt thanks also to Mr. Federico, who patiently gave us the keys of the hypogeum to our researches at all hours of the day.


Translated by Nina Earl



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