Hi Judi & Lee
This is the "Galileo Galilei" an Italian "Archimede -Settembrini" class submarine, captured, south off Aden.
Having participated in the Spanish Civil War, Galilei was stationed in the Red Sea in 1940, when she engaged British warships until she was captured 19-Oct-40, south of Aden in position 12.48N, 45.12E by the ASW trawler HMS Moonstone.
The Italian submarine will be employed by the Royal Navy (initially denominated X.2 since 1942 with the name P.711) for missions of training in Indian Ocean and in Mediterranean (in 1944). It will be scrapped in 1946