817 Squadron RAN—which was responsible for the Westland Wessex helicopters embarked on Melbourne at the time of the collision—was later awarded the Presidential Unit Citation for their rescue efforts.
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The 1993 Llyn Padarn helicopter crash occurred on August 12, 1993, when an RAF Westland Wessex helicopter, serial number XR524, with 3 crew and 4 passengers (all of them Air Training Corps cadets) on board suffered a catastrophic tail rotor failure and plunged into Llyn Padarn, a lake in North Wales.
These helicopter engines were used on the Westland Wessex HAS 1 and HAS 3 (Other versions of the Wessex had 2 Rolls Royce Gnome engines) and the Bristol Belvedere (later Westland Belvedere) transport helicopter.
However, on 25 April the Santa Fe was intercepted while sailing away and disabled by depth charges from Antrim's Wessex helicopter and subsequent attacks by task force Wasp and Lynx helicopters, which fired at least six AS-12 missiles on the submarine.
Her helicopter, the Westland Wessex HAS.Mk3 XP142, nicknamed "Humphrey", was responsible for the remarkable rescue of 16 SAS men from Fortuna Glacier and the subsequent detection and disabling of the Argentinian submarine Santa Fe.