The story
Named after the British Royal Navy survey ship HMS Challenger, whose expedition of 1872–1876 made the first recordings of its depth.
Etymology from Wiktionary, CC BY-SA 4.0.
Challenger Deep
Today it means: A deep in Mariana Trench, Pacific Ocean; a point in the Mariana Trench, known as the deepest point in the world's oceans. Full definition →