How can we conclude that “Challenger Deep” is the deepest part of the ocean. Does that mean we have explored all parts of the ocean?

Question

How can we conclude that “Challenger Deep” is the deepest part of the ocean. Does that mean we have explored all parts of the ocean?

In: 15

Answer 1

It’s the deepest point we have found. We have been looking, but we are not even close to fully mapping ocean floor.

If you find anything deeper we will change what the deepest point is