A high-pitched whine, but from what? It seems to undulate, even writhe. The Associated Press has obtained a recording of what some U. Embassy workers heard in Havana in a series of unnerving incidents later deemed to be deliberate attacks. The recording, released Thursday by the AP, is the first disseminated publicly of the many taken in Cuba of mysterious sounds that led investigators initially to suspect a sonic weapon.
The recordings themselves are not believed to be dangerous to those who listen. Sound experts and physicians say they know of no sound that can cause physical damage when played for short durations at normal levels through standard equipment like a cellphone or computer. What device produced the original sound remains unknown. Americans affected in Havana reported the sounds hit them at extreme volumes. The U. The recordings from Havana have been sent for analysis to the U. Navy, which has advanced capabilities for analyzing acoustic signals, and to the intelligence services, the AP has learned.
But the recordings have not significantly advanced U. The Navy did not respond to requests for comment on the recording. Cuba has denied involvement or knowledge of the attacks.
Not all Americans injured in Cuba heard sounds. Yet the AP has reviewed several recordings from Havana taken under different circumstances, and all have variations of the same high-pitched sound. Individuals who have heard the noise in Havana confirm the recordings are generally consistent with what they heard. The recording being released by the AP has been digitally enhanced to increase volume and reduce background noise, but has not been otherwise altered.
The sound seemed to manifest in pulses of varying lengths — seven seconds, 12 seconds, two seconds — with some sustained periods of several minutes or more. Then there would be silence for a second, or 13 seconds, or four seconds, before the Broken Side Of Time - Alberta Cross - Broken Side Of Time abruptly started again.
To the ear, the multiple frequencies can sound a bit like dissonant keys on a piano being struck all Attacked By The Sound - Bureau De Change - Attacked By The Sound once. Those frequencies might be only part of the picture. Conventional recording devices and tools to measure sound may not pick up very high or low frequencies, such as those above or below what the human ear can hear. Investigators have explored whether infrasound or ultrasound might be at play in the Havana attacks.
The recordings have been played for workers at the U. Embassy to teach them what to listen for, said several individuals A Little Bit Bluer - Eileen Rodgers - A Little Bit Bluer knowledge of the situation in Havana.
Some embassy employees have also been given recording devices to turn on if Attacked By The Sound - Bureau De Change - Attacked By The Sound hear the sounds. The AP reported last month that some people experienced attacks or heard sounds that were narrowly confined to a room or parts of a room.
The symptoms and circumstances reported have varied widely, making some hard to tie conclusively to the attacks. Cuban officials did not respond to requests for comment for this story but have complained in the past that Washington refuses to share information they say they need to fully investigate, such as medical records, technical data and timely notification of attacks.
Lederman reported from Washington. Baldor and Bradley Klapper in Washington contributed. An earlier version of this story incorrectly described the sounds as being between 7, kHz and 8, kHz.
That sentence has been deleted. Dangerous sound? What Americans heard in Cuba attacks. Embassy workers heard in Havana, part of the series of unnerving incidents later deemed to be deliberate attacks.
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