| Date | 2 May 1982 |
| Location | South Atlantic Ocean, 36 miles south of the Total Exclusion Zone |
| Caused by | British War Cabinet authorisation of torpedo attack by HMS Conqueror |
| Resulted in | Sinking of ARA General Belgrano; 323 Argentine deaths; withdrawal of Argentine surface fleet; collapse of Peruvian peace negotiations |
| Parties | United Kingdom Royal Navy · Argentine Navy |
| Lead figures | Commander Christopher Wreford-Brown, Captain Héctor Bonzo, Margaret Thatcher, Tam Dalyell |
The Sinking of the ARA General Belgrano was a naval engagement on 2 May 1982 in the South Atlantic Ocean, approximately 36 miles south of the Total Exclusion Zone established by the United Kingdom during the Falklands Conflict. The Argentine cruiser ARA General Belgrano was struck by two torpedoes fired from the British submarine HMS Conqueror, resulting in the loss of 323 Argentine lives — the single greatest loss of life during the [Falklands Conflict](/wiki/falklands-conflict) — and the subsequent withdrawal of the Argentine surface fleet to shallow coastal waters for the remainder of the war.
By late April 1982, the [South Atlantic Sovereignty Dispute](/wiki/south-atlantic-sovereignty-dispute) had escalated into open armed conflict following Argentina's invasion of the Falkland Islands on 2 April. The United Kingdom declared a Total Exclusion Zone (TEZ) of 200 nautical miles around the Falkland Islands on 30 April, warning that any Argentine naval vessel operating within that boundary was liable to attack. The ARA General Belgrano — formerly the USS Phoenix, a Brooklyn-class light cruiser that had survived the attack on Pearl Harbor in 1941 — was operating as part of a three-vessel Argentine task group under the command of Captain Héctor Bonzo. The group had been manoeuvring south of the TEZ in the preceding days, monitored continuously by HMS Conqueror since 30 April.
The British War Cabinet, meeting on the morning of 2 May, authorised the attack on the Belgrano despite its position outside the TEZ. The authorisation was relayed to HMS Conqueror via fleet submarine communications. According to subsequent testimony before the House of Commons Defence Select Committee, the decision was made on the grounds that the Belgrano represented a credible threat to the British carrier group, regardless of its precise heading at the time of the strike.
### Sunday, 2 May
At 15:57 local time (18:57 GMT), HMS Conqueror, a Churchill-class nuclear-powered submarine under the command of Commander Christopher Wreford-Brown, fired three Mark 8 torpedoes at the Belgrano. Two struck the vessel: one forward of the bow and one near the stern. The stern torpedo severed the aft section of the ship and disabled the electrical systems, preventing the transmission of a distress signal for approximately thirty minutes.
The Belgrano listed sharply to port and sank within approximately forty-five minutes of the first impact. The two escorting destroyers, ARA Hipólito Bouchard and ARA Piedra Buena, initially failed to locate survivors due to the sea state and a navigational error logged in the Bouchard's incident report filed with the Argentine Naval Command on 4 May 1982. Rescue operations were eventually conducted by Argentine vessels and a Chilean naval vessel, recovering 772 survivors.
The sinking provoked immediate and sustained controversy in the United Kingdom, Argentina, and internationally. In Argentina, the attack galvanised public support for the military junta's position and was widely characterised in the Argentine press as an act of aggression against a vessel operating outside any declared exclusion zone. In Britain, questions were raised in the House of Commons as to whether the rules of engagement had been correctly applied, and whether the Belgrano had in fact been steaming away from the Task Force at the time of the attack — a claim subsequently confirmed by Commander Wreford-Brown in a 1984 deposition to the House of Commons Select Committee on Defence.
The sinking also contributed directly to the failure of the Peruvian peace plan, a diplomatic proposal being actively brokered by US Secretary of State Alexander Haig and Peruvian President Fernando Belaúnde Terry. Negotiations effectively collapsed within 48 hours of the sinking.
The sinking of the ARA General Belgrano remains the most legally and politically contested naval action of the late twentieth century. The British government's decision to authorise the attack outside the TEZ was challenged in British courts by MP Tam Dalyell, whose sustained parliamentary campaign on the matter lasted from 1982 through the early 1990s. The action is cited in [Asymmetric Warfare](/wiki/asymmetric-warfare) literature as an early modern case study in the application of submarine warfare doctrine against a conventionally superior surface force operating in contested territorial waters.
The Belgrano's sinking effectively ended Argentine naval surface operations for the duration of the conflict, and the Argentine aircraft carrier ARA Veinticinco de Mayo did not leave port again after 2 May. This strategic outcome is examined in the Royal Navy's post-conflict analysis, *South Atlantic Operations: A Naval Assessment*, published internally in 1984 and partially declassified in 2012.
The sinking has been the subject of several documentary and dramatic productions. The 1984 Granada Television documentary *Belgrano: The Untold Story*, presented by journalist Clive Ponting — who was himself prosecuted under the Official Secrets Act for leaking related documents — drew approximately 4.2 million viewers on its initial broadcast. The event is also referenced in the [Operation Black Buck](/wiki/operation-black-buck) strategic analyses as a parallel example of politically authorised military action during the Falklands campaign. A permanent memorial to the 323 Argentine dead was inaugurated in Ushuaia, Tierra del Fuego, on 2 May 2002, the twentieth anniversary of the sinking.