That watch was custom-made for the dive, though. It was not a regular Rolex diving watch. I think the strongest commercially available diving watches are rated

That watch was custom-made for the dive, though. It was not a regular Rolex diving watch. I think the strongest commercially available diving watches are rated for 1000 meters – less than 10% of the depth of the Challenger Deep. Which is of course itself ridiculous, since the deepest any human has ever dived was 534 meters, and even professional divers very rarely go deeper than 200 meters.