Bathyscaphe Trieste
On 23 January 1960, she reached the ocean floor in the Challenger Deep (the deepest southern part of the Mariana Trench), carrying Jacques Piccard and Don Walsh. This was the first time a vessel, manned or unmanned, had reached the deepest known point of the Earth's oceans. The onboard systems indicated a depth of , although this was revised later to ; fairly recently, more accurate measurements have found Challenger Deep to be between and deep.
USS Cooper: Return to Ormoc Bay
A daring world record scuba dive to the sunken is witnessed by a man who nearly perished on that same ship over sixty years ago. The destroyer was found to be at a depth of 633 feet (193 meters) -- deeper than the world record technical dive of 581 feet (177 meters).