Two men heard their submarine crack 11 kilometers underwater. 🌊

Two men heard their submarine crack 11 kilometers underwater. 🌊 . . . On January 23, 1960, Jacques Piccard and Don Walsh descended about 10,916 meters into Challenger Deep aboard Trieste. Pressure outside reached roughly 8 short tons per square inch. A window component cracked with a violent bang, yet they continued downward—and became the first people to reach Earth's deepest known point.