Whose expedition first measured the depth of the Mariana Trench?
Quick Answer
The deepest part of the ocean was first measured during the Challenger expedition of 1872–1876, led by Charles Wyville Thomson. Later surveys confirmed the trench’s extreme depth, with Challenger Deep now known to be about 10,900 meters deep.
The Full Story
The global ocean depth was systematically explored by the Challenger expedition, led scientifically by Charles Wyville Thomson in the 1870s. Using sounding lines, the expedition identified extraordinary depths in the western Pacific that later became known as the Mariana Trench. Modern measurements have refined the deepest point, Challenger Deep, to roughly 10.9 km below sea level. This work transformed oceanography from a largely descriptive field into a scientific discipline.
Key Facts
YouTube Angle
Suggested video title for this topic:
"The expedition that discovered the deepest place on Earth"