April 10, 1963.
During diving tests, the USS Thresher (SSN 593) was lost with all hands (112 crew and 12 civilians) east of Cape Cod, Massachusetts.
Wikipedia has a thorough piece on the tragedy with a listing of all hands lost.
The Thresher began her last test dive to 1300 feet at 0747, leveled off at 1000 feet at 0825. It is believed a pipe joint failed, and the pressurized water froze preventing blowing of the ballast tanks and closing down the sub’s reactor. The last report from Lt. Commander John Wesley Harvey is initiated at 0917. At 0918 a sound, interpreted as an implosion at somewhere between 1300 and 2000 feet deep, is picked up by surface support ships.
Thresher’s remains were eventually located on the sea floor at 8400 feet in six major sections.
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