The Kola Superdeep Borehole (Russian: Кольская сверхглубокая скважина) is the result of a scientific drilling project of the former USSR. The project attempted to drill as deep as possible into the Earth’s crust. Drilling began on 24 May 1970 on the Kola Peninsula, using the Uralmash-4E, and later the_Uralmash-15000_ series drilling rig. A number of boreholes were drilled by branching from a central hole. The deepest, SG-3, reached 12,262 metres (40,230 ft) in 1989, and is the deepest hole ever drilled, and the deepest artificial point on the earth.
The legend holds that some residents of Siberia (Russia) had drilled a hole that was nine miles (14.5 km) deep before breaking through to a cavity. Intrigued by this unexpected discovery, they lowered an extremely heat tolerant microphone, along with other sensory equipment, into the well. The temperature deep within was 2,000 °F (1,100 °C) — heat from a chamber of fire from which screams of the damned could be heard.tags: