The Great Seal bug, nicknamed “The Thing,” was a covert Soviet listening device hidden inside a wooden carving presented to the US ambassador in Moscow in August 1945. Operating without a battery, the device relied on external radio signals to transmit conversations for nearly seven years.
Times Kerala reported that a youth organization from the Soviet Union gifted the large wooden carving of the Great Seal of the United States to US Ambassador W. Averell Harriman on August 4, 1945. Conceived as a symbol of friendship between World War II allies, the diplomatic gift was subsequently installed in the study of the ambassador’s official residence in Moscow.
Engineering Without Batteries
Soviet scientist Léon Theremin developed the concealed listening apparatus. Unlike conventional microphones of the era, the device required no internal power source or batteries, rendering standard sweeps of the ambassador’s residence ineffective.
The internal architecture of the bug featured a thin membrane and a special metal cavity. When Soviet agents outside the building beamed radio frequencies toward the residence, the device became operational and changes in the reflected signal corresponded to conversations in the room.
This design allowed operators to intercept discussions without ever entering the secure perimeter.
Detection and Global Disclosure
The wooden carving remained hanging in the ambassadorial residence for approximately seven years. US technical security officer Joseph Bezjian discovered the listening device in 1952, working alongside then-Ambassador George F. Kennan to isolate the signal.
Washington delayed public disclosure of the find to thoroughly examine the technology and weigh strategic diplomatic implications. On May 26, 1960, US Ambassador Henry Cabot Lodge Jr. formally presented the spy device before the United Nations Security Council, utilizing it as physical evidence of Soviet espionage.
| Event Timeline | Key Milestone |
|---|---|
| August 4, 1945 | Wooden carving presented to Ambassador W. Averell Harriman in Moscow. |
| 1952 | US security officer Joseph Bezjian discovers the bug in Ambassador George F. Kennan’s study. |
| May 26, 1960 | US Ambassador Henry Cabot Lodge Jr. exhibits the device at the United Nations Security Council. |
The incident encouraged the strengthening of security checks at US diplomatic centers and the development of new defensive technologies.
