The Challenger Deep: Earth's Deepest Point at 36,201 Feet

The Challenger Deep, in the Mariana Trench (western Pacific), is the deepest known point on Earth: approximately 11,034 meters (36,201 feet) below sea level. It was first sounded in 1875 by HMS *Challenger*; the first crewed descent was by Piccard and Walsh in 1960 (*Trieste*). Only a handful of humans have reached it—most recently James Cameron (2012) and Victor Vescovo (2019). The pressure exceeds 1,000 atmospheres; yet microbial life and amphipods persist. It remains one of the planet's last true frontiers.