Living now in Frome, Somerset, it is of note that during WW2 Frome adopted the submarine Thunderbolt - the 'resurrected' Thetis - and that the plaque commemorating that is now held on loan at the Submarine Museum. Sadly thunderbolt was lost in the Mediterranean during the war and thus the total loss of life of Thetis and Thunderbolt is significantly large.
Only just found this Wiki-item!
My late Uncle Roy served in WW2 in HMS Thunderbolt, from 1940 to 1943. Lt. (RNR) R. L. Bird.
If you look up HMS Thunderbolt on Wikipedia, here: Wikipedia
(you may need to scroll down) - he's the officer in the buttoned coat, standing right below their Jolly Roger flag.
(Edit:) I should probably add he was sent to America not long before Thunderbolt was sunk in 1943 by an Italian Corvette, so he was not lost along with his former shipmates. He was responsible for navigation in Thunderbolt and the crew apparently all reckoned that he had the most uncanny knack for dead-reckoning - and somehow, always getting them into the right place at the right time. I have often wondered if, had he still been aboard Thunderbolt, things might have ended differently... anyhow one way or anoither, he survived the War.