The brain damage is real though: https://en.wikipedia.org/wiki/Havana_syndrome https://en.wikipedia.org/wiki/Havana_syndrome > Subsequent studies of the affect

The brain damage is real though: https://en.wikipedia.org/wiki/Havana_syndrome https://en.wikipedia.org/wiki/Havana_syndrome > Subsequent studies of the affected diplomats in Cuba, published in the journal JAMA in 2018, found evidence that the diplomats experienced some form of brain injury, but did not determine the cause of the injuries. The crickets may have just happened to be singing at the time. Or some person had the brilliant idea of making a brain damaging weapon also produce cricket noises to send investigators down the wrong track.