Have you heard about the Mariana Trench?
This is the deepest point in earth, found at the deepest center of the Pacific Ocean. If Mount Everest, the highest mountain in the world is placed here, it would still get covered by the ocean. A depth of 10,994 meters (36,070 feet). The dept hasn’t been found yet!
Here’s a quick blog https://www.livescience.com/23387-mariana-trench.html