The Diaspro was an Italian Gemma Class coastal submarine of 620 tons displacement launched in 1936. The Diaspro was powered by diesel engines providing a top speed of 14 knots surfaced and 8.5 knots submerged and could dive to a depth of 50 fathoms. Armaments consisted of one 3.9 inch gun; two 13 mm anti-aircraft guns and six 21 inch torpedo tubes....