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

Vast majority of the ocean is 4km with some areas to 6km deep. Like 98% ballpark.

To get deeper, like Marianas ~11km mark, you’ll be looking into trenches/canyons. That means you’re already narrowing your target incredibly as to where to look.

From there you do soundings and similar analysis to determine deepest spot.

Worth noting Victor Vescovo’s team is still updating deepest point in many areas, the Five Deeps Expedition incorporated depth locating as part of it’s mission and updated Man’s awareness quite recently.