As of 2026, the Mariana Trench remains the undisputed king of the ocean depths. Its deepest point, the Challenger Deep, sits at approximately 10,935 meters. To put that in perspective, if you placed Mount Everest (8,848m) upside down into the trench, its peak would still be submerged under more than 2 kilometers of water. The pressure here reaches a crushing 1,100 atmospheres, equivalent to having about 50 Boeing 747 jets piled on top of you. Astonishingly, even in this environment of extreme pressure and perpetual darkness, scientists continue to document life forms like amphipods, highlighting the incredible resilience of biology in extreme conditions.