 Tunnels Under the Pyramid of the Sun
Deep in the tunnels under the Bosnian Pyramid of the Sun, expert miners from the nearby Tuzla mine, who were the first to explore these underground areas, found ventilation holes. The oxygen level all throughout the tunnels is around 20%, which is more or less the optimal percentage for unobstructed continuation of the tunnel explorations. It shows a great deal of planning that went into this project and also the engineering skills that the builders of this structure had.
Two large (approx 5 tons in weight), man made, round sand-blocks were found in the tunnels. The team is working on digging out these pieces after which they will take photos and send for analysis. These sand-blocks could be the first related archeological artifacts found.
Stalactites, the icicle-shaped mineral deposits are found hanging from the roof of some parts of the tunnel. These stalactites will help the researches get a better idea of the age of the tunnels.
In the tunnels there are several 90 degree intersections which are parallel to the sides of the world: east -west, north-south. It is evident that the construction of this object was a large engineering challenge.
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