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New details on a series of bizarre attacks, dozens of unexplained illnesses.

Back in 2016, strange reports started coming out of the U.S. Embassy in Havana, Cuba.

U.S. diplomats based here in Havana, said they begin to experience these really strange

symptoms often at night, sometimes while they're in bed, asleep.

The symptoms include hearing strange sounds. Headaches, nausea, vertigo, confusion, and a feeling of heat or pressure.

These illnesses came to be known as Havana Syndrome. The cause was unclear, but there was one common factor in many of these reports, a high-pitched

buzzing or hissing sound.

The sound is a common experience reported by dozens of Americans stricken overseas.

Eventually, one of these diplomats captured a recording of this sound, and a quick disclaimer

that listening to it won't hurt you, but it is pretty shrill and unpleasant, so we've turned

it down a good bit. Here it is.

There were all kinds of theories about what could be making this noise.

That's producer Layla Bateson.

Some guessed it was interference from electronic devices.

Others said it could be a Russian sonic weapon.

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