Havana Syndrome
US diplomats and intelligence officers reported sudden, directional sensations followed by lasting symptoms, starting in Havana in 2016. Seven years of investigation produced two credible and incompatible readings of the same case files.
Why this verdict
Unresolved because the intelligence community judges foreign involvement very unlikely while a National Academies panel found pulsed radiofrequency energy a plausible mechanism for a subset of cases, and neither position has been falsified.
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01The claim
That personnel at US missions were injured by a directed-energy or acoustic weapon operated by a foreign state — most often alleged to be Russia — and that the US government has been slow to acknowledge it.
02Where it came from
In late 2016 US embassy staff in Havana began reporting a sudden onset of pressure, sound perceived as directional, and subsequent headaches, dizziness, tinnitus and cognitive difficulty. Similar reports followed from Guangzhou, Vienna, Hanoi and elsewhere, eventually numbering over a thousand across dozens of countries. The State Department drew down the Havana embassy. Early speculation about a sonic weapon was largely abandoned; an acoustic analysis of one recording concluded the sound matched the Indies short-tailed cricket.
03What the record shows
? UNRESOLVED — A real open question. Credible sources disagree.
The case for a mechanism: a 2020 National Academies of Sciences, Engineering, and Medicine committee examined the clinical findings and concluded that directed pulsed radiofrequency energy was the most plausible explanation for the distinctive acute symptoms in a subset of cases, while noting significant information gaps. A 2022 intelligence community expert panel reached a broadly compatible conclusion about plausibility of a mechanism. The reported cases include people whose symptoms began abruptly, in a specific location, and resolved on leaving the room.
The case against attribution: in March 2023 the Office of the Director of National Intelligence published an assessment in which seven intelligence agencies concluded it was very unlikely that a foreign adversary was responsible, five of them with moderate to high confidence. They found no consistent pattern of adversary activity, no plausible delivery system, and that the great majority of cases could be explained by pre-existing conditions, environmental factors and conventional illness. In 2024 the National Institutes of Health published two studies in JAMA finding no significant differences in brain imaging or biomarkers between affected personnel and matched controls — while noting that the participants' symptoms were real and disabling.
Credentialed people read this evidence differently, in public. Some affected officers and their physicians reject the intelligence assessment as a bureaucratic conclusion; some scientists regard the directed-energy hypothesis as physically implausible at the required power levels. Both readings survive the available data, which is exactly what UNRESOLVED is for.
04What it cost
Congress passed the HAVANA Act in 2021, providing compensation to affected personnel — a rare case of a government legislating financial support for an injury whose cause it has not established. The affected officers' careers and health were genuinely damaged either way, and the dispute over cause has repeatedly been conducted as though acknowledging psychosomatic or environmental contributions would mean the injuries were not real. It would not.
05Connections
06Sources
Government · 2023
Updated Assessment of Anomalous Health Incidents
Academic · 2020
An Assessment of Illness in U.S. Government Employees and Their Families at Overseas Embassies
Academic · 2024
Clinical, Biomarker, and Research Tests Among US Government Personnel and Their Family Members Involved in Anomalous Health Incidents