Deepest earth penetration by man
Since the earth's radius is about km, and the average continental crust is about 35km the maximum depth one could dig would appear to be about % of .
Kola Superdeep Borehole
Description:The stated areas of study were the deep structure of the Baltic Shield, seismic discontinuities and the thermal regime in the Earth's crust, the physical and chemical composition of the deep crust and the transition from upper to lower crust, lithospheric geophysics, and to create and develop technologies for deep geophysical study. Instead the change in the seismic wave velocity is caused by a metamorphic transition in the granite rock. In addition, the rock at that depth had been thoroughly fractured and was saturated with water, which was surprising.
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Date: 2018-08-20
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