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.
USCGC Alexander Hamilton (WPG-34)
During the deep dive the divers set three Icelandic diving records: Deepest wreck dive in Iceland, deepest sea dive in Iceland, and deepest dive ever made in Iceland.