HMS Thetis (N25)
T-class submarine
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HMS Thetis (N25) was a Group 1 T-class submarine of the Royal Navy which sank during sea trials in Liverpool Bay, England on 1 June 1939. After being salvaged and repaired, the boat was recommissioned as HMS Thunderbolt in 1940. Wikipedia
Launched: June 29, 1938
Laid down: 21 December 1936
Test depth: 300 ft (91 m)