Moscow Signal

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The Moscow Signal was a reported microwave transmission, varying between 2.5–4 gigahertz, directed at the Embassy of the United States, Moscow from 1953–1976, resulting in an international incident. The US government eventually determined it was probably an attempt at espionage, and that the concerning health effects on embassy staff were incidental.[1]


The name Moscow Signal was used by United States intelligence officials[2][3] to describe the low power frequencies recorded in the embassy that were feared to be doing harm to the people in the building. The microwave transmissions were only five microwatts per square centimetre,[2] which is well below the power level of microwave ovens, and well below what would be needed to heat anything.[4] However, the frequencies were a hundred times more powerful than the Soviets’ maximum exposure standards,[2][3] which caused concern among U.S. officials.

The microwave beam came from a source in a Soviet apartment building about 100 metres west of the 10-floor embassy building. The beams affected the west side of the building with highest intensities between the third and eighth floors.[1]

During routine background radiation testing, the microwaves were finally detected and sourced to suspected Soviet forces in 1953.[1] During regular monitoring of the signal, the beams were found to have increased in intensity in 1975.[1] The discovery of these microwaves was kept secret from the public and even individuals who had worked in the embassy during the period of suspicion that the microwaves had been directed there.

There are many possible reasons the Soviet Union would have for directing the microwave transmissions at the United States Embassy. Among these possibilities is the most likely theory that the microwave transmissions were used to trigger eavesdropping technology on U.S. intelligence operations.[4] Other theories include a popular, although un-proven, school of thought that the technology was used to interfere with the health, minds or behaviour of the American embassy staff.[4]


Effects on embassy staff[edit]

There is a report of preliminary studies done on the embassy staff that found disturbing results.[5] For example, the report states that one-third of the embassy employees had developed lymphocytosis, an abnormality of the blood-forming system leading to a high count of lymphocytes, a type of white blood cell.[1][5] In addition, there is believed to have been an excessively high rate of cancer among Moscow embassy personnel who were operational in the Moscow Embassy from January 1, 1953 to June 30, 1976.[1] Shielding to the microwaves was not put into place until 11 years after the signal had been detected and recommendations had been made for the staff to be protected.[4]

United States human testing[edit]

In minutes from a May 12, 1969, meeting, the DARPA Pandora scientific committee discussed plans to move forward with eight human subjects.[2] The human subjects would be exposed to the Moscow Signal and then given a full battery of medical and psychological tests. The committee did recommend "gonadal protection be provided" to the male test subjects, however, human testing was not pursued. The program was shut down in 1969, with an effect of the signal on behavior and/or biological functions deemed "too subtle or insignificant to be evident".[2]

Moscow embassy study[edit]

In 1976, after the microwave radiation was found to have increased, the U.S. Department of State commissioned a study led by Abraham Lilienfeld, assisted by the Department of Epidemiology at Johns Hopkins University.[1] The goal of the study was to compare the Moscow embassy staff and their families with the staff and families associated with other eastern European U.S. embassies, who would have shared many similarities in their daily life. The exposed group were staff who had worked at the Moscow embassy from January 1, 1953 to June 30, 1976, and their families in Moscow; and the comparison group was individuals in other selected Eastern European embassies during the identical timeframe, and their families. The results of this study were never officially released to the public.[1]

American paranoia: "The Zapping of America"[edit]

After the news of the Moscow Signal broke to the public, many Americans began to become afraid of the "invisible threat", something they could not see but could kill them. Author Paul Brodeur first warned Americans of the danger of "invisible threats" in the form of a list of environmental hazards to human life, which included detergent enzymes, cancer-causing asbestos fibers and ozone-depleting fluorocarbons in spray cans.[5] In Brodeur's book The Zapping of America, he warns that Americans are exposed to lethal levels of radiation from missile-tracking radars, TV transmitters and even the common household microwave oven.[5] In an interview with People Magazine, Brodeur explains that although the United States maximum exposure standard is 10 milliwatts per square centimeter,[6] that standard is unenforceable. As well he explains that there have been multiple animal experiments which resulted in "changes in brain chemistry and the central nervous system, abnormalities of the blood-forming systems and birth defects."[5] Later in the interview he cautions that the amount of radiation that the average household microwave oven leaks is "500 times higher than Eastern European and Soviet standards for worker exposure and 5,000 times the recommended limits for the general population."[5] Concerns arose from Americans that microwaves could be used as a weapon for behavior modification, or even mind control.[2] What may have started out as a "tin-foil hat" theory,[2] soon spiralled into full-blown paranoia that gave birth to many suspicions some still hold to this day, such as not to watch food while it warms up in the microwave.[5]

Relation to the Cold War[edit]

Technological advancement[edit]

The Cold War is believed to have begun with the signing of the Truman Doctrine, which threatened Soviet communist and expansionist policies and ideologies. The term "cold" is used to describe this war as there was no actual large-scale fighting between the two major powers involved, the United States and the Soviet Union. The Cold War was fought as an arms race and relied on espionage to cause damage to the opposing country. The Moscow Signal was used during the period of The Cold War commonly referred to as "Confrontation Through Détente".[7] The signal is just one example of the new technologies developed during The Cold War to be used to spy on the transmissions of other countries without needing a human intelligence agent. Cold War espionage was ruthless and drastically changed international relations. In cases like the Moscow Signal, the health of individuals was potentially put at risk by new and untested technologies, and this was often the case in the Cold War.

Alexei Kosygin with U.S. President Lyndon B. Johnson at the summit.

The Glassboro Summit of 1967[edit]

The Glassboro Summit Conference was held in June 1967. It was a meeting of President Lyndon B. Johnson and Premier Alexei Kosygin, leaders of the United States government and Soviet government, respectively—for the purpose of discussing Soviet Union–United States relations. It was held in Glassboro, New Jersey. During the course of this meeting, the United States made several protests to the Kremlin over the use of microwave technology.[4] However, the protests were unsuccessful as the microwave technology was used on the United States embassy in Moscow for several years to come.[4]

Related incidents[edit]

Alleged weapon attacks on U.S. embassy staff in Cuba[edit]

Beginning in 2016 and ending in 2017, several American and some Canadian diplomats in hotels in Havana, Cuba were jarred with a high pitched, mechanical noise that later caused hearing loss and speech problems,[8] as well as difficulty balancing and seeing.[9] Listen to the noise in this video.The attacks were often confined to a single room or a specific area of a room,[8] indicating the weapon has the ability to target areas with "laser-like specificity."[8] Investigators have several theories about the attacks actually being intentional and performed by Cuba's government, rogue Cuban security forces or a third country, likely Russia.[8] Officials are baffled, as a device to target sound waves with such specificity would be very large and difficult to conceal fully.[8] The "sonic attacks", a term now avoided by the United States government,[9] have led to confirmed perceptible changes in the victims' health such as changes to white matter tracts in the brain, concussion-like symptoms and even nosebleeds.[8][9] Again, these attacks have led to a fear in the Western public of weapons that are invisible but cause irreparable damage to their victims.[9] Unlike the Moscow Signal, the source of these attacks is the Indies short-tailed cricket Anurogryllus celerinictus, in the family Anurogryllus, comparable to a 2017 hypothesis from Cuban scientists that the Jamaican field cricket was responsible.[10][11][12][13]

Uzbekistan incident[edit]

In September 2017, a USAID officer and his wife reported an acoustic attack similar to those experienced by the diplomats in Havana.[14] The two suffered similar effects and were taken out of Uzbekistan by the State Department to have themselves and the situation further evaluated.[14] It is unclear what further diagnosis or care the officer and his wife had received after leaving Tashkent.[14] The State Department declined to describe the situation in detail. Because Uzbekistan was once a part of the Soviet Union, this incident raises suspicion among U.S. officials of Russia's involvement in both this specific incident and the Cuban sonic attacks.[14]

See also[edit]


  1. ^ a b c d e f g h Elwood JM (November 2012). "Microwaves in the cold war: the Moscow embassy study and its interpretation. Review of a retrospective cohort study". Environmental Health. 11: 85. doi:10.1186/1476-069X-11-85. PMC 3509929. PMID 23151144.
  2. ^ a b c d e f g "The Secret History of Diplomats and Invisible Weapons". Foreign Policy. Retrieved 2018-05-11.
  3. ^ a b Lake, Jennifer (September 19, 2012). "The Moscow Signal". Jennifer Lake's Blog. Retrieved 2018-05-12.
  4. ^ a b c d e f Reppert, Barton (May 22, 1988). "Zapping an Embassy: 35 years later, the mystery lingers". Times Daily. Retrieved 2018-05-14.
  5. ^ a b c d e f g Jerome, Jim (January 30, 1978). "The Microwave Menace Is Zapping Us All, Warns Writer Paul Brodeur". People Magazine. Retrieved 2018-05-21.
  6. ^ Brodeur, Paul (1977). The Zapping of America: Microwaves, Their Deadly Risk, and the Coverup. W W Norton & Co Inc. ISBN 978-0393064278.
  7. ^ "The Cold War". Wikipedia. Retrieved 2018-05-18.
  8. ^ a b c d e f "Mystery of sonic weapon attacks at US embassy in Cuba deepens". The Guardian. 2017-09-14. Retrieved 2018-05-21.
  9. ^ a b c d "Brain abnormalities found in victims of US embassy attack in Cuba". The Guardian. 2017-12-06. Retrieved 2018-05-21.
  10. ^ Sara ElShafie, 4 January 2019, "The Cuban Cricket Crisis"
  11. ^ Zimmer, Carl (January 4, 2019). "The Sounds That Haunted U.S. Diplomats in Cuba? Lovelorn Crickets, Scientists Say". Retrieved January 6, 2019 – via
  12. ^ StoneFeb. 15, Richard; 2018; Pm, 5:00 (February 15, 2018). "U.S. diplomats in Cuba have unusual brain syndrome, but there's no proof they were attacked, study says". Science - AAAS. Retrieved January 6, 2019.
  13. ^ Stone, Richard (December 8, 2017). "Cuban panel claims stress caused mystery illnesses". Science. 358 (6368): 1236–1237. doi:10.1126/science.358.6368.1236. PMID 29217550. Retrieved January 6, 2019 – via
  14. ^ a b c d Dorsey, Steve (2017-11-28). "Uzbekistan incident raises suspicions of Russian involvement in Cuba attacks". CBS News. Retrieved 2018-05-20.


  • Brodeur Paul, The Zapping of America Microwaves, Their Deadly Risk, and the Coverup (New York: Norton, 1977).
  • Dorsey, Steve. "Uzbekistan Incident Raises Suspicions of Russian Involvement in Cuba Attacks." CBS News. November 28, 2017. Accessed May 23, 2018.
  • Elwood, L. Mark. "Microwaves in the Cold War: The Moscow Embassy Study and Its Interpretation." National Centre for Biotechnology Information. November 14, 2012. Accessed May 21, 2018.
  • Jerome, Jim. "The Microwave Menace Is Zapping Us All, Warns Writer Paul Brodeur." People Magazine, January 30, 1978. Accessed May 21, 2018.
  • Reppert, Barton. "Zapping an Embassy: 35 Years Later, the Mystery Lingers." Times Daily (Northwest Alabama), May 22, 1988. Accessed May 14, 2018.,3660202&hl=en.
  • "The Moscow Signal." Jennifer Lake's Blog. October 11, 2012. Accessed May 23, 2018.
  • Washington, Associated Press in. "Mystery of Sonic Weapon Attacks at US Embassy in Cuba Deepens." The Guardian. September 14, 2017. Accessed May 23, 2018.
  • Washington, Associated Press in. "Brain Abnormalities Found in Victims of US Embassy Attack in Cuba." The Guardian. December 6, 2017. Accessed May 23, 2018.
  • Weinberger, Sharon. "The Secret History of Diplomats and Invisible Weapons." Foreign Policy. August 25, 2017. Accessed May 23, 2018.