The average depth of the world's oceans is 12,430 feet with the deepest point being the Mariana Trench with a depth of 6.8 miles.
Almost 7 miles (35,840 feet).
It's deepest part is known as the challenger deep. Named after the Royal Navy ship, HMS challenger that first sounded it back in December 1872 to may 1876, who recorded a depth of 31,614 feet, (9,363...
Approximately 6 1/2 miles at its deepest part
people think that its 10,923 miles meters deep. In English that would be about 35,798 ft or 6.7 mi.
2 39/88 miles (3.93 kilometres)