Summary: This week the Flannelcasters talk about the Kola Superdeep Borehole - the deepest borehole ever drilled by humans, extended nearly 12 km below the surface of the Earth.
Summary: This week the Flannelcasters talk about the Kola Superdeep Borehole - the deepest borehole ever drilled by humans, extended nearly 12 km below the surface of the Earth.