Deepest- Under The Sea

The deepest part of the ocean is the Mariana Trench, an oceanic trench located in the Pacific Ocean near the island nation of Guam. At its deepest point, known as the Challenger Deep, the Mariana Trench is almost seven miles (11 kilometers) below sea level. Just to put that in a frame of reference, if we were to shave Mount Everest off the surface of the Earth and drop it into the Mariana Trench, it would disappear, buried in over a mile of water.The pressure in the Mariana Trench is extreme: about 1,000 times the atmospheric pressure at sea level. Organisms like humans which are accustomed to life at sea level would implode within fractions of a second if exposed to that depth, and the creatures which live in the Mariana Trench demonstrate a number of unusual adaptations which help them cope with the pressure. Algae, bacteria, marine worms, and other unusual creatures live in the total darkness and extreme cold of the Mariana Trench, interrupted only occasionally by survey submarines sent to explore the deepest part of the ocean for science.

The first survey of the Mariana Trench was undertaken in 1951 by a British team on board the Challenger II. Since the team discovered the deepest point of the trench, the Challenger Deep was named after them.