Kola Superdeep Borehole
Dec. 25, 2024
Why Did the Russians Seal Up the Deepest Hole in the World ... DSCVR - Do you know 😱 Kola Superdeep Borehole is the deepest man ... The sealing-cap of the abandoned 'Kola Superdeep Borehole ... Kola Superdeep Borehole