Shayari Bazar

The deepest hole ever drilled by man is the Kola Superdeep Borehole, in Russia. It reached a depth of 12,261 meters (about 40,226 feet or 7.62 miles). 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