Royal Navy Swiftsure Class SSN
The Royal Navy’s Swiftsure class nuclear attack submarine, proxied from a Sturgeon. Features the excellent and not at all famously rubbish Tigerfish Mk 24 torpedo! (Don’t worry I added the slightly less useless Mod 2 version). Also featured is the Swiftsure in her 1990’s configuration with advanced Harpoons and Spearfish torpedoes (requires NTU).
If you find the Tigerfish goes too deep and hits the sea floor; first fire only on a bearing, not at a target, then assign the target later, it should run at 50ft depth rather than plunging.