The Probert Encyclopaedia of Ships

SEAWOLF

HMS Seawolf was a British Sealion Class submarine of 670 tons displacement launched in 1935. She was armed with one 3-inch gun; one machine-gun and six 21-inch torpedo tubes in the bow. She had a top speed of 13.75 knots surfaced and 10 knots submerged and carried a complement of 40.
Research Seawolf