An assassination unit of Russia’s main military intelligence force – known as GRU – has been targeting U.S. diplomats, their families and other Western officials for at least ten years with a novel acoustic weapon.

According to a series of investigative reports published by The Insider, the GRU Unit 29155 may have used an unknown type of pulse weapon that hits with microwave radiation, which causes terrible headaches, migraines, loss of consciousness or concentration, and ultimately deteriorates the brain and incapacitates the victims.

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The effects of this attacks are called “Havana Syndrome”, after the largest incident with the suspected use of the mysterious weapon: in 2016, many employees of the U.S. and Canadian consulates in the Cuban capital suddenly felt sick, experiencing severe pressure and pain in their ears, nausea and panic, and getting overwhelmed by strange sounds - either a loud noise or a very high-pitched sound similar to the chirping of a grasshopper.

The consequences of that experience haunted them for months or even years: blurred consciousness, problems with concentration, loss of balance out of the blue, hyperacusis, problems with sleep.

Over time, other American diplomats, officials, military personnel, and CIA agents throughout the world complained of similar experiences.

Medical tests have made it possible in many cases to detect objective evidence of traces of trauma to certain areas of the brain and thereby exclude psychosomatics.