Harry Houghton and Ethel Gee Sold Admiralty Secrets to Moscow

By Vera Kessler · August 19, 2026

A naval clerk and his colleague leaked classified underwater detection data for a decade, a betrayal that stayed hidden until their capture and conviction in 1961.

The silent war beneath the waves relied on secrets that Harry Houghton treated as currency. For ten years, the security of the British fleet was compromised by a man who viewed his oath as a suggestion, leaving naval commanders blind to the extent of their own exposure.

In the high-stakes game of underwater warfare, the ability to detect a submarine before it is detected is the only margin that matters. When that advantage is sold to the opposition, the result is not merely a loss of data, but a direct threat to the lives of every sailor on patrol. The file's catalogue entry from the UK National Archives, reference KV 2/4383, records the trajectory of one such breach: the case of Harry Frederick Houghton.

A Clerk in Portland

Houghton did not hold a rank that would typically draw the scrutiny of counter-intelligence. He was a clerk, a man of paperwork and filing, stationed at the Admiralty Underwater Detection Establishment at Portland. It is a position of invisibility that provides an ideal vantage point for a spy. The catalogue description notes that Houghton "conspired with another employee Ethel Gee to pass classified material to the Soviet Union."

In the world of espionage, the most dangerous asset is often the one who is overlooked. By partnering with Gee, Houghton created a domestic loop of betrayal, ensuring that the flow of intelligence from the establishment to Moscow was steady and shielded from the casual observations of their peers. The nature of the material they passed—underwater detection—was central to the Cold War struggle for naval supremacy. While the catalogue entry does not specify which documents were handed over, the location of their employment suggests that the Soviets gained insight into the very methods the British used to track submarines in the North Atlantic.

The Warsaw Embassy

The catalyst for this decade of betrayal likely lay further east. The file's catalogue entry records that before his time at Portland, Houghton "had previously worked at the British Embassy in Warsaw."

Warsaw in the early Cold War was a predator's environment. For a British official, it was a place where recruitment attempts by the Polish and Soviet intelligence services were not a possibility, but a probability. The public record identifies Houghton as a spy for both the Polish People's Republic and the Soviet Union, suggesting that his time in Poland provided the initial bridge to his handlers. Whether he was coerced, bought, or ideologically driven is not detailed in the archival description, but the timing is telling. The consensus among investigators, as noted in the catalogue record, was that he had been active as a spy from 1951 until the moment of his arrest.

1951 to 1961

The span of Houghton's activity represents a catastrophic failure of internal security. For ten years, he operated within the heart of a sensitive naval installation without detection. This was not a momentary lapse or a single act of desperation, but a sustained campaign of espionage.

Across the UK National Archives, the scale of the Security Service's interest in Houghton is evident. Beyond the primary record in KV 2/4383, related files such as KV 2/4384 and KV 2/4385 exist, marking him as a primary subject in the "Personal (PF Series) Files" dedicated to Soviet intelligence agents and suspected agents. The repetition of these files underscores the intensity of the investigation once the thread was finally pulled.

The betrayal ended in 1961, when Houghton was convicted of espionage. The arrest of the Portland spy ring stripped away the anonymity of the clerical staff and exposed the fragility of the Admiralty's trust. It revealed that the most sensitive technical data in the kingdom could be walked out of a building by a clerk and a colleague who knew exactly which files the Soviets wanted.

While the catalogue entries provide the framework of the crime—the names, the dates, and the locations—they leave a void regarding the specific cost of the leak. We know that Houghton and Gee worked together and that they spied for a decade, but the record does not list which specific detection systems were compromised or how many ships were put at risk. The files leave us with the conviction of 1961, but the full extent of what the Soviet Union learned from the Portland office remains a matter of historical inference.