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US#OTD in 1961, USS Thresher (SSN 593) was commissioned.
Thresher was lost with all hands on April 10, 1963 during deep-diving tests about 220 miles east of Cape Cod, Massachusetts - #USSThresher's remains were located about 8,400 feet below the surface on the sea floor.
The loss of #Thresher led to the Navy establishing the Submarine Safety Program (SUBSAFE), to provide maximum reasonable assurance that submarine hulls will maintain watertight integrity, and that the boats can recover from unanticipated flooding. This rigorous quality control program oversees any and all systems that are exposed to seawater or would be critical to recovering the boat in the event of flooding.
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