The full area of Crimea is a home of good number of not well studied underground towns the upper layers of which are exposed by erosion / earthquakes. The blueprints of at least 2 different civilisations could be identified by the style and scale of erosion. The first one would be millions of years old, while the "younger" one just couple of hundred thousand years old... This does not even include the historic stone quarries in the region. After adding them we have minimum 5 unknown civilisations digging in the region (see the videos for details).