Ravne Tunnel Labyrinth: A Prehistoric Tunnel Dug Out of a Hill Built in its Entirety in Ancient Times

by Jock Doubleday

“So the people who sell souvenirs, here [near the entrance to Ravne Tunnel Labyrinth in the Bosnian Pyramid Complex] have decided to hire a backhoe, and they have sculpted out more of this hill to make more room for these souvenir tables, there.

“So we have free excavation — ‘we’ meaning the [Archaeological Park] Foundation [a nonprofit Bosnian NGO foundation created by Dr. Sam Osmanagich, discoverer of the Bosnian Pyramids, on November 9, 2005 in Sarajevo, Bosnia-Herzegovina] — and we can see that this hill is built. And we have these [alternating] layers [of claystone and soft clay], as always.

“Now, these are leftward-leaning, which is interesting. [Most layers in built structures in the Bosnian Pyramid Complex are rightward-leaning.] . . . And we have clay layers that extend all the way behind the Museum. And if you’d like to go behind the Museum, you can see those very obvious clay layers as part of your tour! . . .

“But look at these incredible leftward-leaning stones. Absolutely massive. This thing is huge! . . . And it keeps going. . . . So the ancients were not fooling around. Look at all this leftward-leaning structuring to this hill.

“Now, this is the hill in which children played in a small tunnel or a cave. Up there by that white awning, just past there, there’s an entrance to Ravne Tunnel. And that was found by Dr. Semir Osmanagich [in 2005] by asking the children if they had a tunnel or a cave that they played in.”

“And we can see, here, that we’ve got a layer of [ancient] concrete on top of this layering of clay and claystone . . . So the concrete starts there. That’s the line, right there. Above that is beton, as they call it in Bosnia. Concrete. And you can see it clearly. And below that is clay layers — clay layers for absorbing kinetic energy from earthquakes, among other things. . . . Clay performs many functions in the building of hills and pyramids here in Bosnia. It’s sound insulation, thermal insulation, waterproofing, and, in fact, earthquake-proofing.

“It looks like they dug behind there, as well. [We’re] finding these incredible layers of clay- / sand-stone, whatever you want to call this. But the [heated] clay is the binding material. If there’s a lot of sand in there, too, that’s their choice in the moment. They seem to morph their materials from place to place.

“So there’s the layer of concrete, artificial concrete, that was placed above. And you can see how strong that concrete is. When they dig into it, you can get kind of a feel for how strong it is. I mean, it looks kind of weak, because there’s these little pieces coming out, here. And you say, ‘That’s just rubble.’ It’s not rubble. It’s really, really, really, really strong concrete.

“And it’s the strongest documented concrete on the planet. And when I say ‘it,’ I mean the concrete that has been sampled [2.5 kilometers to the southeast] on the Bosnian Pyramid of the Sun, which has an upper hardness rating of 133 Megapascals, which is twice as strong, twice as hard, as most modern concretes [and harder than any concrete ever sampled by science, ancient or modern].

“Most modern concretes have an upper hardness rating of 60 Megapascals. And the Bosnian Pyramid of the Sun concrete has an upper hardness rating of 133. So, 2 times 60 is 120, [and therefore] 133 is 13 Megapascals more than twice as hard as our normal, modern-day concretes.

“Now, some modern-day concretes go up to 80 Megapascals, but 133 is just unheard of and outrageous.

“And this is concrete that has been here for tens of thousands of years — we don’t know how many years — and it’s still that hard. So, if you took modern-day concrete and let it sit out for tens of thousands of years in the rain, and then tested it, like we tested the ancient concrete here, it would not be 133 Megapascals. It would not be its original 60 or 80 Megapascals. It would probably be 20 or 30. . . .[For an in-depth explanation of Megapascals, see video titled, “Super-durable concrete on the Bosnian Pyramid of the Sun – an explanation of megapascals“]

“Another factor in the concrete durability is the water absorption [rate]. The water absorption rate of the Bosnian Pyramid of the Sun concrete is 1.1%, and the lower the water absorption rate, the better. The best water absorption rate of modern-day concrete is 3% . . . Therefore, the concrete on the Bosnian Pyramid of the Sun is almost three times less likely to absorb water as the best concrete that we make in modern day. . . . The water doesn’t get in as much in the winter. . . . And therefore it doesn’t freeze inside the concrete in the winter, and therefore it doesn’t expand and break the concrete. So water is not a problem in general for the ancients’ concrete. This is concrete that Robert Schoch calls natural. This is concrete that Graham Hancock calls natural. This is concrete that Wikipedia calls natural. This is concrete that Zahi Hawass calls natural.”

(Above quote excerpted from the video, “Ravne Tunnel Labyrinth: A Prehistoric Tunnel Dug Out of a Hill Built in Ancient Times” (October 1, 2015)

What did the ancients mean when they talked about clay? “The etymology of clay is glue.”

How hard is the concrete on the Bosnian Pyramid of the Sun? It’s the hardest concrete ever tested, ancient or modern — far harder than ancient Roman or modern concretes.

Watch a huge mechanical digger — the biggest in Bosnia — fail to get through it. This is the concrete that Graham Hancock calls natural “pudding stone.” 🙂

Further research:

Ever heard of a built riverbed? Neither has academia. 🙂
Megastructure: The Fojnica Riverbed Winding through the Bosnian Pyramid Complex Is an Ancient Artificial Megalithic Structure (January 23, 2018)”

“The Mysterious Anti-Scientific Agenda of Robert Schoch – Part 1: The Bosnian Pyramid Complex

“The Mysterious Anti-Scientific Agenda of Robert Schoch: Part 2 – The Yonaguni Monument 与那国記念碑


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