In 2016, US diplomats in Cuba began reporting strange symptoms like headaches, dizziness, nausea, and hearing odd sounds. This condition was called Havana syndrome. No cause or device was found then. Years later, similar cases appeared in China, Europe, and even inside the US. Scientists and intelligence agencies were divided on the cause, with theories ranging from stress to directed energy attacks. In 2023, a Norwegian government scientist who doubted the energy attack theory built a homemade microwave device. After exposing himself to it, he experienced symptoms similar to those in Havana syndrome. Norwegian authorities informed the US. Officials from the CIA, Pentagon, and White House reviewed the case. While the experiment didn’t prove an attack, it showed pulsed energy might affect the nervous system. This reopened the debate. US intelligence assessments suggest most cases are unlikely caused by foreign attacks, but the illness is real. The scientific community remains split, with some urging more research and others warning against assuming exotic causes. Despite no clear answers, those affected by Havana syndrome suffer real health issues. The mystery remains unsolved nearly a decade later, leaving many questions about what truly happened to US personnel in Cuba and beyond.