The Delfim was a British-built Portuguese submarine of 813 tons displacement launched in 1934. the Delfim was powered by Vickers diesel engines providing a top speed of 16.5 knots surfaced and a range of 8000 km at 10 knots and electric motors providing a top speed of 9.25 knots. She carried a complement of 36 and was armed with one 4 inch gun; two...