The Mariana Trench is the deepest place in any ocean. It’s a long, narrow scar in the Pacific seafloor, near the island of Guam, where two of Earth’s tectonic plates collide. At its lowest point - the Challenger Deep - it drops to nearly 11,000 meters below the surface. That’s about 36,000 feet straight down.
To picture how deep that is, imagine standing on the ocean floor at that point and putting Mount Everest on top of you. Everest stands about 8,849 meters tall - which means the peak of the world’s tallest mountain would still be more than 2,000 meters underwater. You could swim above it for another mile.
The pressure at the bottom is around 1,100 atmospheres - basically a thousand times the air pressure you feel at sea level. Specially built submersibles have made it down a handful of times. Most equipment that goes down implodes long before reaching the bottom.
