About how deep is Challenger Deep in the Mariana Trench, the deepest known point in the ocean?

The answer

A 2021 NOAA-led analysis of 2020 submersible dives put the deepest observed seafloor at 10,935 meters (±6 m), a hair over 11 km. That's deeper than Mount Everest is tall, at more than 1,000 times surface pressure.

Correct answer: About 11 kilometers (roughly 36,000 feet)