Question: When was the last time a us submarine sunk?
qaPairs: question: When was the last time a us nuclear submarine sunk?
answer: May 22, 1968
question: When was the last time a decommissioned us submarine sunk?
answer: 1 June 1971
question: When was the last time a us submarine sunk prior to commissioning?
answer: 15 May 1969
question: When was the last time a us non-nuclear submarine sunk?
answer: 18:57 on 29 May 1958
29 May 1958