Navis Neptun 1171 HMS Thunderbolt, an early T-class submarine, 1942 1/1250
Formerly HMS Thetis, which sank on trials with the loss of most of her crew, she was re-named Thunderbolt and re-commissioned only to be sunk by the Italian corvette Cocogna off Sicily.
Thunderbolt was an early T-class boat with the waist-mounted torpedo tubes facing forward to give a "cannot possibly miss" spread of torpedoes! Truculent represents the later boats, designed for more stealth and higher underwater speed. Thunderbolt was sunk in the Mediterranean.