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. It served during the Second World War until being lost with all hands in the Mediterranean on 14 March 1943.
HMS Thunderbolt returning from patrol during WWII
Image: THETIS badge 1
Image: THUNDERBOLT badge 1
Mersey Docks & Harbour Board salvage vessel Vigilant and the sunken Thetis's raised stern
British T-class submarine
The Royal Navy's T class of diesel-electric submarines was designed in the 1930s to replace the O, P, and R classes. Fifty-three members of the class were built just before and during the Second World War, where they played a major role in the Royal Navy's submarine operations. Four boats in service with the Royal Netherlands Navy were known as the Zwaardvisch class.
HMS Thorn
On board submarine HMS Tribune in 1942
HMS Totem in September, 1945