US Embassy Havana, Cuba · 2016 to Present · Partially Declassified
In late 2016, personnel at the US Embassy in Havana began reporting a specific and unusual symptom cluster. A sudden onset of pressure or vibration in the head, sometimes preceded by a directional sound. Immediate cognitive disruption. In some cases, a distinct sensation of heat on exposed skin. The symptoms resolved when the person moved away from a specific location. They returned when the person returned to that location.
By 2017, the State Department had confirmed cases in multiple embassy personnel, including CIA officers. Neurological evaluations found measurable brain tissue changes in some affected individuals. These were not psychosomatic. They were visible on imaging. People had been physically injured by something while standing in specific locations inside a US diplomatic facility.
What that something was has not been officially confirmed.
The University of Pennsylvania's Center for Brain Injury and Repair evaluated a cohort of affected Havana personnel beginning in 2017. Their findings, published in JAMA in 2018, documented white matter changes, alterations in cerebellar tissue volume, and disruptions to functional connectivity in the visual and auditory networks. The affected individuals showed neurological profiles that resembled concussion without any physical impact having occurred.
The pattern of injury was specific enough that the researchers described it as a distinct clinical entity. These were not common presentations of stress, anxiety, or mass psychogenic illness. The imaging findings were objective and measurable. Something had altered the brain tissue of these individuals.
Subsequent evaluations of personnel affected in other countries produced similar findings. The neurological signature was consistent across cases that occurred years apart and thousands of miles from each other, which argues against a localized environmental cause specific to Havana.
In 2020, the National Academies of Sciences, Engineering, and Medicine released an assessment commissioned by the State Department. Their conclusion was that pulsed radio frequency energy was the most plausible explanation for the reported symptoms and the observed neurological findings. They specifically referenced the Frey effect, a documented phenomenon in which pulsed microwave energy produces the perception of sound in the human head through direct neural stimulation, bypassing the ear entirely.
The Frey effect was documented in the 1960s. Its existence is not disputed. At certain pulse parameters, microwave energy causes the tissues of the head to undergo rapid thermal expansion and contraction, producing a pressure wave that the cochlea interprets as sound. The effect can be produced at power levels that do not cause measurable heating of tissue. It can be directional. It can be targeted to a specific location from a distance.
The National Academies report did not identify a source, a perpetrator, or a specific device. It identified a mechanism that was consistent with the evidence. That is a significant narrowing of the hypothesis space. It is not a resolution.
In 2023, the Office of the Director of National Intelligence released an assessment concluding that the anomalous health incidents were unlikely to be the result of a foreign adversary's sustained campaign using a directed energy device. The assessment attributed most cases to pre-existing conditions, environmental factors, and stress. It found that a small number of cases remained unexplained.
The assessment was immediately disputed by affected personnel, their attorneys, and several members of Congress who had received classified briefings. CIA officers who had been medically evaluated and found to have objective neurological injury described the assessment as inconsistent with their medical records. The gap between the ODNI's public conclusion and the findings in classified medical evaluations has not been reconciled in any publicly available document.
Several CIA officers affected by the syndrome have since left the agency and spoken publicly. Their accounts describe a pattern of institutional skepticism, delayed medical care, and pressure to attribute symptoms to non-injury causes despite imaging evidence to the contrary.
The question of whether a portable directed energy device capable of producing the documented injuries at operational range exists is not addressed in any publicly available document. The physics of the Frey effect are established. Microwave weapons have been a subject of military research in the United States and Russia since the 1970s. The Active Denial System, a US military crowd-control device, uses millimeter-wave energy to produce a burning sensation on the skin at ranges exceeding 500 meters. Its existence is public and its operation is documented.
Whether a device exists that can produce targeted pulsed radio frequency energy at the frequencies, power levels, and pulse parameters that the National Academies identified as consistent with the Havana findings is a question that classified research programs in multiple countries could answer. Whether any of those programs have produced such a device is not established in any available public record.
Over 1,000 US government personnel across 90 countries have reported the same symptom cluster. A significant subset has measurable brain tissue changes on imaging. The National Academies identified a plausible physical mechanism. The intelligence community's public conclusion contradicts the medical findings in a number of documented cases. The device that would produce these effects, if it exists, is not described in any declassified document. The affected personnel are still waiting for an explanation that matches what their neurological evaluations show.
The Interference
The Interference is built on the same question these documents refused to answer.
Receive Transmissions
New books. Release dates. The documents behind the fiction. No noise.