Ruskealsky gap is a place in Karelia. It's a huge hole about ten
meters (33 ft) deep with water on its bottom. As locals say it formed in
the 1960s after strong explosions
in the neighboring quarry. The roof of the old waterlogged tunnels
broke and fell into the water. A huge hole 20 x 30 m (65x100 ft)
appeared on the surface.
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