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It's still going to be a pretty big chunk of seafloor, right?

Right, but they had the exact coordinates of that F-35 that fell off the carrier into the Med, which is a far shallower sea, and it still took weeks to find it.

I'd like to see them succeed, but it's just too unlikely they will find anything. Might get a few detailed undersea maps out of the effort though, but that's about it.

High accuracy is 100s of kilometers in this case?