Also... a while back I picked up Jacques Cousteau's old stuff on DVD. Boy, that guy sure did harp about how humans were going to ensure their own extinction because they raped the environment. What a whiner.
Anyway, one of the shows shows them diving on the same wreck (if memory serves -- I don't have the disks here or I'd check) and coming up with (for example) a missing piece of a small bronze statue recovered 100 years ago. S'cool. The Antikythera mechanism is shown on museum display.
I well remember ol' Jack Cousteau's standard fundrasing pitch back in the seventies: that man would pollute the oceans to death and then we would all asphyxiate.
Nevertheless, things have come down quite a ways since the Kon-Tiki days when the flying fish and bonitos would practically throw themselves at Thor Hyerdahl and co. ("to starve to death was impossible").