Koba Superdeep Borehole reached 12,262 m in 1989, was expected to reach 15,000 m in 1993 but fail due to unexpected higher temperatur, 180°C in this depth location
Koba Superdeep Borehole reached 12,262 m in 1989, was expected to reach 15,000 m in 1993 but fail due to unexpected higher temperatur, 180°C in this depth location