Preamble at Vienna’s Operation Silver. The daring Berlin Tunnel took inspiration from Operation Silver, a successful British intelligence mission in Vienna. The MI6 discovered that the Soviets were using Austrian telephone lines to connect their military headquarters in the capital to Moscow. Thus, Operation Silver—a covert mission that involved building a tunnel beneath the Imperial Hotel and tapping into these military communications. The British then shared their findings with the CIA, setting the stage for their joint operation in Berlin. The mission not only proved a success but also profitable, as MI6’s cover business also turned out to thrive.

Operation Gold. As they drew inspiration from a previous British intelligence endeavor triumph, the CIA embarked on its fascinating covert mission beneath the streets of Berlin, aptly codenamed Operation Gold.

Berlin, a.k.a. the hottest hotbed for intel-gathering. As the Cold War unfolds, Berlin found itself literally torn into two: East and West. The city has then become a focal point for intelligence activities. Both the CIA and the Soviet Union engaged in high-stakes espionage, vying for the upper hand in this strategic city. This is also where the audacious American intelligence tunnel project would stretch, beneath Berlin’s Bernauer Strasse, where the infamous division wall would later stand.

Do you know BOB? After WWII, the US established its military headquarters in Berlin and, subsequently, the CIA’s Berlin Operating Base (BOB). This American section housed key divisions, including secret intelligence and X-2 counterintelligence, making it a crucial hub for intelligence gathering and analysis. One of its pivotal contributions was the tracking of the Soviet atomic bomb development program and had provided vital insights during the Berlin blockade in 1948.

The Man, The Myth, The Legend—CIA’s Mastermind: William King Harvey. A seasoned CIA officer, Harvey led the covert endeavor that would later become known as Operation Gold. Renowned for his daring exploits and vast expertise, Harvey earned the reputation of a hard-living and relentless agent. He’s not called “America’s James Bond” for nothing.

Leveraging his skills, Harvey recruited double agents operating within East Germany, procuring invaluable intelligence on the communication infrastructure within the Soviet-claimed territory. The success of the tunnel operation hinged upon these crucial insights, enabling effective tapping into Soviet lines.

There was a MOLE. A British intelligence officer, George Blake, attended a briefing about Operation Gold. However, unbeknownst to the CIA and the British, Blake was a Soviet mole who promptly reported vital information to his Soviet handler. This left the Soviets with a dilemma—whether to stop the operation or protect their mole—and they chose the latter.

Despite being aware of the imminent spy tunnel, the Soviets made a surprising decision to hold back and refrain from immediate action. This intriguing choice can be attributed not only to the presence of a planted mole within their adversaries’ ranks but also to their calculated strategy of employing disinformation and counterintelligence. By allowing the tunnel to continue operating, the Soviets saw an opportunity to execute a well-calibrated deception, utilizing the tapped lines to feed misleading information back to the CIA. It was a strategic game of high stakes—a relentless game of cat-and-mouse chase, with both sides keenly aware of the consequences of prematurely revealing their hand.

Construction of the Berlin Tunnel began in 1954. After meticulous planning, the monumental building of the spy tunnel finally began in 1954. The US Army Corps of Engineering led the digging beneath the Soviet-occupied sector of Berlin, while British allies handled the vertical shaft connecting to the Soviet telephone cables. Construction crews disguised themselves as repair workers, covertly operating in the shadows to maintain secrecy. Meanwhile, the rest of the CIA and SIS teams coordinated the logistics and managed the delicate balance between speed and discretion. The tunnel extended 1,476 feet beneath the ground and reached the Soviet border, providing access to vital communications.

Harvey’s Hole. (No pun intended) The tunnel operation, nicknamed “Harvey’s Hole,” allowed the CIA to intercept Soviet and East German communications, providing unprecedented insight into their military strategies and activities. The underground became a hub for intel bonanza, with CIA agents monitoring over 500 connections simultaneously, transcribing conversations, gathering valuable information, and recording military and political discussions. However, the tunnel eventually got exposed despite its operational success for nearly a year.

Abrupt Ending. Amidst its operation, an unexpected rainfall in April 1956 flooded the tunnel, exposing the wires and leading to its accidental discovery by a Soviet maintenance crew. The CIA officers hastily retreated, leaving behind a mocking note for the Russians.

Nevertheless, Operation Gold, or the Berlin Tunnel, remains one of the most remarkable intelligence operations of the early Cold War. It showcased the daring efforts of the CIA and SIS, their ability to tap into crucial Soviet military communications, and their unwavering pursuit of strategic advantage.

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You might want to check out “The Cold War: A New History” by John Lewis Gaddis. Grab a copy here!