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Warning to the readers

Maintenance work continues in Ravne, but when excavations will resume in the tunnels seems most uncertain


TAG: pyramids Bosnia, Bosnian pyramids, Visoko Civilization, pyramids, archeology, artifact, Ravne tunnels

The two workers of the Foundation still on-site, Edo and Salko, continue their work of shoring and reinforcement of props in the tunnels.
But it seems that changes are necessary for future conservation. Under direction from a professional archaeologist these changes would only be a little different from the methods implemented up to now.


Fig. 1 - The maintenance work is carried out only by two workers (Ajdin Ahmetspahic photos)

In any case hard times loom for the Bosnian Pyramid of the Sun Foundation, which takes care of the excavations in Ravne tunnels. The global financial crisis has led to a dramatic reduction in donations from private sponsors which have allowed it to continue digging, even in winter.


Fig. 2 - Tunnel passages that do not have secure access are closed to public (Ajdin Ahmetspahic photos)

There is now the possibility that there are no funds to pay the team of workers who, last winter, allowed non interruption of the research inside Ravne tunnels and led to significant successes, such as the discovery of new section unsealed tunnel (here) or the discovery of artifacts (here).


Fig. 3 - Moment to fatigue for Salko who remains one of the best workers (Ajdin Ahmetspahic photos)

Probably the excavations will resume only in January with the arrival of a dedicated budget for all of 2012 by the Bosnian Government.

Ravne tunnels will remain open all winter for sightseeing.


Fig. 4 - Outside, the problem of water drainage remains a serious problem in Ravne tunnels (Ajdin Ahmetspahic photos)

Meanwhile, researchers of SBRG will maintain their presence in this archaeological site pursuing other lines of research. Unfortunately we had to suspend excavations, which had just begun, to unearth the underground structure discovered in July of this year, because, without support of the Foundation workers, it’s impossible to construct the access ramp down to the structure.

Paolo Debertolis & Richard Hoyle - October 28, 2011




While we are waiting to resume the excavations, Foundation's workers continue maintenance work in Ravne’s Labyrinth

TAG: pyramids Bosnia, Bosnian pyramids, Visoko Civilization, pyramids, archeology, artifact, Ravne tunnels

Maintenance work continues in tunnels of Ravne by replacement of decayed or insufficient supports. The work is being carried by two workers of  Foundation of the Pyramid of the Sun under direction of leading archaeologist, Sara Acconci.

In November, to resume the excavation work, we will wait for the return of a greater number of workers of the Foundation and volunteers who have decided at their own expense to continue the work.
What is becoming more clear to our research group is that the builders of the tunnels had the same problems of partial collapses like present time.

For this reason they remedied it with long sections of dry stone walls on the side of the tunnels where it was necessary to expand the size.


Fig. 1 - Where there is a dry stone wall there isn’t any collapse. In upper images the section recently opened and that closes the third alveolus path in the tunnel Ravne (images by Ajdin Ahmetspahic)

As it can be observed from the images, where workers have shored up tunnels many times, tunnels sometimes modified by the workers for various reasons, sometimes if there is a failure of a support beam you can have a collapse of  the vault with material falling. Where there is a dry stone wall on the side of the tunnel, there isn’t any collapse of the structure even though it is not shored up.


Fig. 2 - Where the path of the tunnel was enlarged by the workers of the Foundation for various reasons, eliminating the catenary profile, despite the props, the material tends to fall from the side of the walls impeding the passage (image by Ajdin Ahmetspahic)


Fig. 3 - In the enlarged and propped tunnels, if props are rotten or not sufficient in number you can observe a collapse. At the present moment the workers are strengthening all areas that are at risk and replacing damaged props (images by Ajdin Ahmetspahic)

This method of using dry stone walls on the sides of tunnels has often been used in prehistoric and early historic periods and it indicates the high level of awareness and knowledge that the builders of Ravne’s Labyrinth had.

Paolo Debertolis - October 14, 2011




Two more items of news from Ravne Labyrinth

TAG: pyramids Bosnia, Bosnian pyramids, Visoko's Civilization, pyramids, archeology, artifact, tomb, Ravne tunnels

The first. Work was concluded on the reunion of two lateral tunnels which led to a new circle in the typical alveolar structure of Ravne’s Labyrinth.

This arrangement is very similar to alveoli of a lung, which is becoming an increasingly more prevalent characteristic of this archaeological site.


Fig. 1 - The overlay of the pulmonary alveoli compared with the structure of the tunnel (image by L. Krasovec Lucas from her presentation at ICBP2011 conference)


Fig. 2 - The point of entry and exit of the new tunnel passage marked by yellow arrows


Fig. 3 - Some pictures of the new communication tunnel in the filming of our photographer Ajdin Ahmetspahic

The second news is about the niche carved out for building the access ramp to the structure in order to bring to light the structure located under the floor of the tunnel Ravne.
During the deepening of the niche in the wall of the tunnel was discovered a circular room with five very low lateral tunnels arranged very regularly.

Faced with this unexpected new discovery, the possibility of access to the structure changed again and a new approach is required, in order to not destroy this room.


Fig. 4 - The position of the tunnel carved in the wall and the round room newly discovered marked by orange arrow and circle


Fig. 5 - Images of the round room, stone walls and five low side tunnel/niches (foto Ajdiin Ahmetspahic)


Paolo Debertolis - Saturday, September 16, 2011




Momentary pause in the work of excavation in the structure located under the floor in Ravne's Labyrinth

TAG: pyramids Bosnia, Bosnian pyramids, Visoko's Civilization, pyramids, archeology, artifact, tomb

After clearing of the area from the infiltration of water, it’s necessary to await a moment before proceeding with the excavation to recover the structure.

We must ensure that there is no further infiltration of water before the re-start.

The Foundation has created a niche in the wall of the tunnel in front of the centre of the future excavation site to create the access ramp, yet unbuilt.

The excavation has been recomposed and burial of the new drainage pipe in the ground so as to facilitate movement along the passage. The structure will be excavated from the side by the ramp starting from the newly built niche.

Thanks to images by the photographer of SB Research Group, Ajdin Ahmetspahic, now we can document the current situation.


Fig. 1 - Scheme (image by professor Lucia Krasovec Lucas - Politecnico di Milano). The stretch of the tunnel is where the structure is located. The numbers refer to the direction of the figures below (click to enlarge)


Fig.1 a and b. Images of the entrance of the tunnel where is the structure located under the floor of the gallery


Fig.2 Image directed to the structure upstream the retaining wall against water infiltration


Fig. 3 - Image taken from the niche built in front of the zone of digging. The structure is located below the wheelbarrow


Fig. 4 - Image of the niche built in front of the structure to hold the ramp to access to the structure (yet to be constructed)


Fig. 5 - Image of the area where is the underground structure.


Fig. 6 - Image taken from the opposite side upstream the retaining walls against water infiltration


Paolo Debertolis - September 5, 2011




Finally finished work to defend site of excavation from water in Ravne’s Labyrinth

TAG: pyramids Bosnia, Bosnian pyramids, Visoko's Civilization, pyramids, archeology, artifact, tomb

Work finished on the second structure downstream from the archaeological site of excavation in Ravne Labyrinth.


(Photos Aidjn Ahmetspahic)


Now all the site of excavation is dry. On Tuesday they will resume digging the artifact to investigate. Maybe there will be some changes to the initial project plan.

Paolo Debertolis for SB Research Group - August 15, 2011




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