World’s DEEPEST underground STRUCTURES, represented on a real scale, mines, caves, cities, tunnels, installations, etc.
Depth is measured from the lowest point to the surface, not to sea level.
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World's Deepest Underground Structures
World’s DEEPEST underground STRUCTURES, represented on a real scale, mines, caves, cities, tunnels, installations, etc.
Depth is measured from the lowest point to the surface, not to sea level.