Today
Currently, the hole remains roughly a third of the way through the Baltic Continental crust at 40,230 feet or 7.5 miles deep. It is known as the deepest borehole in the world, but it’s mysteries are still being analyzed and feared today.
Before the Kola borehole was drilled, scientists could only hypothesize about what lay beneath the earth’s surface. Still, they thought they had a pretty good idea of what to expect. But they were wrong.