Located in the northwest Pacific Ocean, within the oceanic depression known as the Mariana Trench, it is the deepest known point in the world: the Challenger Deep. It is one of the most mysterious and inaccessible places of the planet, being situated at 10,902 meters below sea level and about 2000 meters above the height of Mount Everest. On 23 January 1960, the oceanographer Jacques Piccard and the lieutenant Don Walsh, on board the bathyscaphe Trieste, achieved to reach this unknown darkness. ...