Reminds me of the Havana Syndrome event at the US and Canada Embassies in Cuba. In 2017 several people who worked there reported feeling strange symptoms from ringing ears to nausea to cognitive dysfunction. Despite several years of research and study no cause was ever found. It was also determined that it could not be caused by a yet-to-be-known weapon by a US adversary. Despite this, the Pentagon still has conducted research in the effects of long-term exposure to RF waves in animals to see if they could make the symptoms of Havana Syndrome manifest.