how deep is the deepest part of the ocean

The deepest known part of the ocean is the Challenger Deep in the Mariana Trench, reaching roughly 10,900–11,000 meters (about 36,000 feet) below sea level.

Quick Scoop

• Name of deepest point: Challenger Deep, in the Mariana Trench (western Pacific Ocean, south/southwest of Guam).

• Depth range from modern measurements: about 10,920–10,994 meters (≈35,800–36,100 feet).

• That’s deeper than Mount Everest is tall; if you “dropped” Everest into it, the peak would still be more than a mile underwater.

• Pressure at the bottom: over 1,000 times sea-level pressure (more than 1,000 bar; around 15,000+ psi).

• Average depth of all oceans (for comparison): about 3,682 meters (12,080 feet), so Challenger Deep is roughly three times deeper than the global average.

A tiny “depth story”

Imagine standing on the beach and slowly descending into the water:
at a few meters, light is still bright; by a couple hundred meters, it’s already dim and cold; by 1,000 meters, it’s pitch-black. Keep going down past 5,000 meters, 8,000 meters, and finally near 11,000 meters, where Challenger Deep lies—crushing pressure, near-freezing temperatures, and total darkness, yet specially adapted deep‑sea creatures still survive.

TL;DR: The deepest part of the ocean, Challenger Deep in the Mariana Trench, is about 10.9–11 kilometers (around 36,000 feet) below the surface—so deep that Mount Everest would disappear under more than a mile of water.

Information gathered from public forums or data available on the internet and portrayed here.