Secret Landing at Cow Bay/Playa Vaca
Operation Cow Beach was conceived in the shadows of a turbulent era—an epic chapter in the history of the Argentine Navy, where determination and stealth combined to confront a challenge that had lingered for over a century. The year was 1966, and Argentina, ruled by a military junta following the overthrow of President Arturo Illia, was growing weary of its diplomatic claims over the sovereignty of the Falkland Islands. The shadow of British incursion, cast over the islands since 1833, loomed heavily in the minds of naval strategists.
The incident involving Aerolíneas Argentinas Flight 648, hijacked by a group of extremists and diverted to the archipelago, had stirred already turbulent waters. It was a stark reminder that the situation in the Falklands could escalate without warning, and that Argentina needed to be prepared for a confrontation scenario. Thus, in the shadowy offices of Buenos Aires, a plan was drawn up involving one of the fleet’s most veteran submarines—the ARA Santiago del Estero, a former USS Lamprey from the Second World War, repurposed as the guardian of a secret mission.
Aerolíneas Argentinas Flight 648 was hijacked by Argentine extremists on 28 September 1966 and diverted to the Falklands, where they meekly surrendered to the British colonial authorities.
On 28 October 1966, with its diesel engines roaring beneath the waves, the ARA Santiago del Estero silently navigated the frigid waters of the South Atlantic. Under the command of Frigate Captain Horacio González Llanos and Corvette Captain Juan José Lombardo, the submarine stealthily approached the coast of East Falkland, just 40 kilometres from Port Stanley, the capital of the British colony. On board, twelve Navy men—including Sub-Lieutenant Oscar Héctor García Rabini—waited tensely for the moment to act.
Diagram of the Navigation Route Taken by Submarine S-12 ARA Santiago del Estero of the Argentine Navy During Operation "Cow Beach", Late October 1966
Cow Bay, Soledad Island/East Falkland (Argentine Republic)
The plan was clear: they were to land on a remote beach, just a few kilometres north of the British position, to gather vital intelligence for future landings. The beach had to be thoroughly surveyed—its gradient, potential underwater obstacles, approach routes—everything needed to be charted without leaving a trace. In the dimness of night, the men assembled their kayaks on the deck of the barely surfaced submarine, and the silence was broken only by the gentle lapping of the waves.
Crew and Command Staff of Submarine S-12 ARA Santiago del Estero – Argentine Navy.
Arrival of S-12 ARA Santiago del Estero (SS-372 USS Lamprey) at Mar del Plata Naval Base from the United States, 1960
(Photograph by Enrique Mario Palacio)
The two Balao-class submarines, S-11 ARA Santa Fe and S-12 ARA Santiago del Estero, which served in the Argentine Navy between 1960 and 1971, should not be confused with the later submarines of the same class modernised to GUPPY IA standard—S-21 and S-22—which replaced them from 1971 onwards and carried the same names. In this image, the veteran S-11 and S-12 can be seen at the end of their service life at the Mar del Plata Naval Base, while in the background lies the new S-22 ARA Santiago del Estero, their replacement, ready to take on the duties left behind by its predecessors. The S-12 ARA Santiago del Estero was retired after a decade of service, having taken part in important missions such as Operation Cow Beach, which became a notable chapter in the history of the Argentine Navy.
S-12 ARA Santiago del Estero Moored at its Home Pier, Mar del Plata Naval Base.
The First Incursion and an Unexpected Encounter
The first incursion was a success. The men landed and explored the coastline, mapping every detail. However, the second night brought an unexpected twist. In the darkness, García Rabini spotted a kelper—a local island settler—watching them from atop a cliff. They knew that being discovered could spark an unprecedented diplomatic crisis. Acting swiftly, they captured the islander and tied him up as they debated their next move. Killing him was not an option—the mission was one of intelligence gathering, not combat. But they also couldn’t risk the man alerting the British authorities.
Then, an idea emerged—both bold and unusual. Some crew members returned to the submarine to fetch a bottle of whisky from the captain’s cabin. They went back to the cliff and forced the kelper to drink until he was semi-conscious, leaving him behind at the very spot where they had found him. With the mission aborted to avoid further complications, the group returned to the submarine, carrying with them the valuable intelligence they had collected.
Born on 19 March 1927 in Salto, Buenos Aires Province, Juan José Lombardo was a key figure in the history of the Argentine Navy. As a Sub-Lieutenant, he served as Second-in-Command aboard submarine S-12 ARA Santiago del Estero during the successful Operation Cow Beach in the Falkland Islands on 28 October 1966—a mission that would become a landmark in Argentina's intelligence operations in the South Atlantic. On 15 December 1981, by then holding the rank of Vice Admiral, he was summoned by the Chief of Naval Staff, Admiral Jorge Isaac Anaya, to receive a mission that would alter the course of Argentine history: the Falklands.
The Return to Mar del Plata
The journey back to Mar del Plata was as silent as the outbound voyage. Upon arrival, absolute silence was ordered regarding the events that had taken place. None of the participants—not even to their families—were to speak of what had happened in the frigid waters of the South Atlantic. Despite the unforeseen developments, the mission was deemed a success. The data gathered was handed over to the Navy General Staff—a strategic asset that could have proved critical had diplomatic negotiations failed.
The two Balao-class submarines, S-11 ARA Santa Fe and S-12 ARA Santiago del Estero, which served in the Argentine Navy from 1960 to 1971, should not be confused with later submarines of the same class—modernised to GUPPY IA standard—S-21 and S-22, which replaced them from 1971 and bore the same names. In this image, one of the original submarines is seen underway shortly after its arrival in Argentina, already without the forward gun that had been removed as part of its adaptation and modernisation for new missions in the South Atlantic.
Legacy of a Silent Mission
Years later, Commander García Rabini would recall those days with quiet pride, fully aware of the significance of the mission. Although the Cow Beach operation report was not directly used during the 1982 Falklands conflict, it stood as a testament to the commitment and audacity of those sailors who defied history to keep the flame of Argentine sovereignty alive.
The Story of Operation Cow Beach
Interwoven with both legend and fact, the story of Operation Cow Beach remains a hidden episode within the broader struggle over the Falklands—a moment when a small group of men faced the sea, the darkness, and the looming shadows of a war that, though not yet begun, echoed with the weight of the inevitable. It stands as a reminder that the fight for sovereignty is not waged solely on battlefields, but also in silences, in the waves, and in the whisper of the wind on a lonely South Atlantic beach.
Commander Oscar Héctor García Rabini. Now aged 83, retired Commander Oscar Héctor García Rabini is the Argentine naval officer who, in 1966 as a Sub-Lieutenant, led one of the most daring missions in the history of the Argentine Navy. At the head of a special forces incursion, he landed on the shores of East Falkland on 28 October of that year, during the secret Operation Cow Beach. Launched from the depths of the ocean by the submarine S-12 ARA Santiago del Estero, the mission was cloaked in silence and darkness, aimed at collecting vital intelligence to support Argentina’s sovereignty claims over the Falkland Islands/Islas Malvinas.
Cow Beach/Playa Vaca, Southern Tip – Photograph Taken from ARA Santiago del Estero by Miguel Salvatierra, 28/10/1966
Balao-Class Submarine S-12 ARA Santiago del Estero. The Balao-class submarine, formerly the US Navy’s SS-372 USS Lamprey, served the United States from 1944 until 1960, when it was transferred to the Argentine Navy and renamed S-12 ARA Santiago del Estero. In the photograph, the submarine is seen departing from the Mar del Plata Naval Base, home to Argentina’s Submarine Force Command. It operated from this base until 1971, when it was replaced by the S-22 ARA Santiago del Estero—a submarine of the same class but modernised to the GUPPY IA standard. The arrival of this updated vessel marked the end of an era for the veteran S-12, which had taken part in key operations such as Cow Beach, demonstrating the Navy’s steadfast commitment to national sovereignty.
ASW Frigate P-36 ARA Piedrabuena in the Periscope Crosshairs of ARA Santiago del Estero During Combat Exercises
Cargo Transfer Between Submarine ARA Santiago del Estero and Destroyer D-10 ARA San Luis
Surface Navigation of S-12 ARA Santiago del Estero en Route to Its Objective. As a Balao-class submarine that had not undergone the GUPPY IA modernisation, the vessel lacked a snorkel and high-capacity batteries. Consequently, it still had to operate like a Second World War-era submarine—navigating mostly on the surface, at least at night and in low-risk areas.
