In December 2016, an undercover CIA officer stationed in Havana experienced a sudden and severe onset of symptoms including a splitting headache, dizziness, strange sounds, and a sensation of pressure on his body. Similar cases soon emerged among other CIA personnel and their families, not only in Cuba but also in cities across the globe including Moscow, Guangzhou, Beijing, Hanoi, Vienna, London, and Washington, D.C. These incidents, collectively referred to as "Havana Syndrome," have baffled intelligence and medical communities for years.

Veteran CBS producers Michael Rey and Oriana Zill de Granados, who have extensively investigated the phenomenon, have documented these accounts in detail. Their reporting reveals a pattern of mysterious, concussion-like injuries affecting CIA officers, their relatives, and in some cases, pets. Symptoms have included intense headaches, tinnitus, vertigo, and in several cases, long-term brain damage requiring medical evacuation to the United States. Some affected personnel were forced to retire prematurely due to the severity of their conditions.

The origin and nature of Havana Syndrome remain inconclusive, with theories ranging from attacks using unknown directed energy weapons to psychosomatic explanations such as mass hysteria or social contagion. The U.S. government’s initial response leaned toward skepticism, with some officials reportedly reluctant to attribute the incidents to foreign attacks, possibly due to political sensitivities and concerns over admitting a new form of hostile technology.

Rey and Zill de Granados’ investigations suggest these are deliberate attacks rather than psychological phenomena. They trace several cases to possible Russian involvement, highlighting intelligence reports that link one of the suspected assailants—the son of a commander of Russia’s GRU Unit 29155, known for covert operations abroad—to an attack on a CIA officer’s wife in Tbilisi. Despite this, conclusive proof implicating any state actor remains elusive.

Internal tensions within U.S. intelligence also surfaced, with reports that then-CIA Director Gina Haspel resisted briefing former President Donald Trump on suspected Russian involvement, reportedly fearing political fallout. The reluctance to disclose or pursue these leads reportedly delayed a comprehensive U.S. government response.

While the narrative assembled by Rey and Zill de Granados provides the most thorough public account to date, the presentation occasionally lacks chronological clarity, weaving together cases from different years and locations without a linear progression. Some factual inaccuracies, such as conflating Russia’s intelligence services with the Soviet-era KGB, also appear.

Despite these limitations, their work contributes significant insight into an enigmatic and ongoing security challenge. Havana Syndrome remains an unresolved issue for U.S. intelligence agencies, underscoring broader concerns about emerging methods of covert attack amid escalating global tensions.