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 pretty much means that we just haven’t found anything deeper. The ocean floor is roughly mapped with enough precision that it’s unlikely for there to be a deeper spot, but it’s not impossible.