- Education and Science
The Kola Superdeep Borehole: The World's Deepest Man Made Borehole
Place: Kola Peninsula, Russia
Depth: 12,262 meters (40,230 ft) or about 7 mile
Russian: Кольская сверхглубокая скважина
Penetrates about a third of the way through the Baltic continental crust (35 km or 22 mi)
The Kola Peninsula Superdeep Borehole (KSDB) was part of a scientific study launched by the then Soviet Union in the Kola Peninsula across from Finland. The project attempted to drill as deep as possible into the Earth's crust.
It took the drillers nearly 25 years to drill the astounding 40,000+ ft borehole. They were only ceased drilling when temperatures soared to an unbearable, unsafe 180°C (356 °F).