The Probert Encyclopaedia of Ships

SUBTLE

HMS Subtle was a British Sealion Class submarine of 715 tons displacement launched during the early 1940's. HMS Subtle was armed with one 3-inch gun; one 20 mm anti-aircraft gun; three machine-guns; six 21-inch torpedo tubes in the bow and one external 21 inch torpedo tube. She had a top speed of 14.5 knots surfaced and 10 knots submerged, could crash dive in 30 seconds and carried a complement of 44.
Research Subtle