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I particularly like the 285ft on air. People would lose their minds if someone posted on here they were doing air dives at that depth now!
... Chief Stillson's assignment coincided with the development of early submarines, and the tragic accidents that accompanied them. Stillson and his divers were sent to salvage the submarine F-4 after she sank off Pearl Harbor Hawaii with all hands in 1915. She was in 306'/93M of water. Divers experienced severe impairment caused by Nitrogen Narcosis which prompted the US Bureau of Mines to suggest Helium-Oxygen as a breathing mixture...
We were just in training and... let's just say that none of were at our best. Can you imagine salvaging a submarine on air that is even deeper?
... But I love that not only did they happen but that you got a certificate to applaud it!