Which ocean is the deepest, reaching about 10,935 metres at Challenger Deep?

The Pacific Ocean is the deepest ocean, reaching about 10,935 metres at Challenger Deep.

Challenger Deep lies in the Mariana Trench, east of the Mariana Islands in the western Pacific. Its extreme depth is greater than the height of Mount Everest above sea level. Exact measurements vary slightly with instruments and surveying methods, but all modern measurements identify it as Earth's deepest known marine point.

The Pacific is also the largest ocean, stretching between Asia and Australia on the west and the Americas on the east. Its name comes from the Latin pacificus, meaning peaceful, a name associated with Ferdinand Magellan's 16th-century voyage. The Pacific Ring of Fire surrounds much of its basin.