From: The temperate climate zone
We got that one fixed a while back
But seriously, wasn't there in 1982 a RN door gunner that seriously damaged an Argentinian sub outside of South Georgia?
Yeah, found it:
Some hours later, after leaving Grytviken, Santa Fe was detected on radar by Lieutenant Chris Parry, the observer of the Westland Wessex HAS.3 anti-submarine helicopter from HMS Antrim, and attacked with depth charges. This attack caused extensive internal damage, including the splitting of a ballast tank, the dismounting of electrical components and shocks to the machinery. As the submarine struggled to return to Grytviken on the surface, HMS Plymouth launched a Westland Wasp HAS.1 helicopter, and HMS Brilliant launched a Westland Lynx HAS.2. The Lynx dropped a Mk 46 torpedo, which failed to strike home, but strafed the submarine with its pintle-mounted 7.62 mm L7 General Purpose Machine Gun (GPMG). The Wessex also fired on the Santa Fe with its GPMG. The Wasp from HMS Plymouth as well as two other Wasps launched from HMS Endurance fired AS-12 air-to-surface anti-ship missiles at the submarine scoring hits. Santa Fe's men and the marines onshore attempted to fight off the attack by firing their rifles, machine guns and an old Bantam antitank missile on the aircraft, but the Argentine boat was damaged badly enough to prevent her from submerging or even from sailing away. The crew abandoned the listing submarine at the jetty at King Edward Point on South Georgia and surrendered, along with the Argentine garrison, to the British forces. Brilliant's diving officer, Lt. Chris Sherman, went down to place a charge to disable the submarine further, and blew off its rudder.