The South Georgia force, Operation Paraquet, under the command of Major Guy Sheridan RM, consisted of Marines from 42 Commando, a troop of the Special Air Service (SAS) and Special Boat Service (SBS) troops who were intended to land as reconnaissance forces for an invasion by the Royal Marines.
On 25 April, after resupplying the Argentine garrison in South Georgia, the submarine ARA Santa Fe was spotted on the surface by a Westland Wessex HAS Mk 3 helicopter from HMS Antrim, which attacked the Argentine submarine with depth charges.