MIR submersibles historic dive under the ice dome at the geographical North Pole: It has never happened before that small open window was overhead submersible crew instead of the immense ocean surface

Abstract

As of September, 2007, thousands have been to the summit of Mt. Everest, 437 astronauts have been to space, 13 men have stepped on the Moon, and only 2 people reached the deepest part of the ocean on Earth at 11,000 meters (35,800') in the Challenger Deep of the Marianas Trench.