Its a deep hole called Kola Superdeep Borehole, in Russia. It reached a depth of 12,261 meters (about 40,226 feet or 7.62 miles). It's the deepest hole ever drilled by man.
It was drilled for scientific research and gave up some unexpected discoveries. One of which was a huge deposit of hydrogen - so massive that the mud coming from the hole was boiling with it.
1 comments:
Interesting
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