thumb|304px|Gibraltar
Operation Algeciras was a failed Argentine plan to sabotage a Royal Navy warship in Gibraltar during the Falklands War. The Argentine reasoning was that if the British military felt vulnerable in Europe, they would decide to keep some vessels in European waters rather than send them to the Falklands.
A commando team observed British naval traffic in the area from Spain during 1982, waiting to attack a target of opportunity when ordered, using frogmen and Italian limpet mines.
The plan was to launch divers from Algeciras, have them swim across the bay, to Gibraltar, under cover of darkness, attach the mines to a British naval ship and swim back to Algeciras. The timed detonators would cause the mines to explode after the divers had time to safely swim back across the bay. The plan was foiled when the Spanish police became suspicious of their behaviour and arrested them before any attack could be mounted.
Background
Planning
The operation was conceived, ordered and directly managed by Admiral Jorge Anaya, who at the time was a member of the National Reorganization Process and head of the Argentine Navy. The plan was top secret and not shared with other members of the government. Anaya summoned to his office Admiral Eduardo Morris Girling, who was responsible for the Naval Intelligence Service, and explained to him the convenience of hitting the Royal Navy in Europe. Girling would be the one who would make the plan and select the participants but Anaya remained in charge of the operation throughout.
Striking in the United Kingdom was considered at first but it was thought that the commandos would have difficulty remaining unnoticed and Spain was chosen because the commandos could more easily pass unnoticed as tourists.
Participants
The leader of the operation was Héctor Rosales, a spy and former naval officer. He was in charge but would not participate in the actual placing of the mines which was left to the experts. Three former members of the Peronist guerrilla Montoneros were convinced to participate in spite of the earlier repression of the Montoneros by the military.
The leader of the commandos was Máximo Nicoletti, a diver and expert in underwater explosives. His father served in the Italian Navy's underwater demolition team during the Second World War and thereafter owned a diving business. In the early '70s Nicoletti had joined the Montoneros and engaged in urban insurgent actions against the military junta. On 1 November 1974, Nicoletti placed a remote-controlled bomb under the yacht of the police chief of the Argentine Federal Police, Alberto Villar, who was killed together with his wife.
On 22 September 1975, while the destroyer was still under construction in Buenos Aires, Nicoletti placed an explosive charge under the hull which caused it to sink. Later in the decade, Nicoletti was arrested by the infamous Grupo de Tareas 3.3.2 of the Navy Mechanics School, but escaped serious punishment by cooperating with the authorities.
Soon, due to his cooperation and expertise, he managed to get himself appointed to carry out a similar submarine attack against a Chilean ship because tensions between Chile and Argentina were high due to the Beagle dispute. This attack was not carried out in the end because the disagreement between Chile and Argentina was finally resolved peacefully. Nicoletti was then sent to Venezuela as a spy but he was discovered and had to return to Argentina. Shortly after he settled in Miami, but when he heard of the Argentine invasion of the Falkland Islands he immediately got in touch with the Argentinian government in case his services were needed and he was instructed to return to Buenos Aires.
The other two commandos, both also ex-Montoneros, were Antonio Nelson Latorre and another man who went by "Marciano," subsequently revealed to be Abel Adolfo Ojeda. Both had participated with Nicoletti in earlier sabotage plans. In the event of capture, Argentina would deny all knowledge. The agents were to say they were Argentine patriots acting on their own. They had orders not to do anything which could involve or embarrass Spain, to sink a British naval vessel and to get express approval from Anaya before carrying out any attack.
When planning the operation in Argentina it was decided that acquiring or manufacturing explosives in Spain would prove too difficult and so two explosive mines with timed detonators would be shipped to Spain via diplomatic pouch and would be delivered to the commando group in Spain. Italian limpet mines were acquired for this purpose and shipped to Spain in diplomatic pouch as planned.
Situation in Spain
At that time the political climate in Spain was unstable with the government of Leopoldo Calvo Sotelo having political difficulties on many fronts, including with the military who mistrusted him. The trials for those responsible for the military coup attempt of 23-F a year earlier were concluding and this further raised tensions. The Basque terror group, Euskadi Ta Askatasuna, were very active and police checkpoints were common.
The upcoming 1982 FIFA World Cup in Spain meant the police were very alert to any suspicious or terrorist activity. The police requested that everybody remain vigilant, and that people should report anything unusual, especially within the travel industry.
Execution
Infiltration
The commandos were issued counterfeit Argentine passports under false names and marked with false earlier entry stamps to Spain. This was done so the Argentine government could deny any involvement in case the commandos were discovered, and the passports were made by another former Montonero, Víctor Basterra.
On 24 April, Nicoletti and Latorre left Buenos Aires for Paris where Latorre's passport raised the suspicions of French authorities, but they were allowed to continue their onward travel by air to Málaga.
A 2003 documentary featured interviews with Anaya, Nicoletti and other participants. In one interview, Nigel West, a British writer who specialises in covert operations, claimed that the UK, aware of the covert plans thanks to telephone taps of conversations between Argentina and its embassy in Madrid, had informed Spanish authorities of the operation ahead of time.