IT SOUNDS sort of like a mass of crickets. A high-pitched whine, but from what? It seems to undulate, even writhe.
Listen closely: There are multiple, distinct tones that sound to some like they’re colliding in a nails-on-the-chalkboard effect.
The Associated Press has obtained a recording of what some US Embassy workers heard in Havana in a series of unnerving incidents later deemed to be deliberate attacks which left US diplomats suffering mild brain damage including memory loss and loss of cognitive ability.
The recording, released overnight, is one 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 mobile phone or computer.
What device produced the original sound remains unknown. Americans affected in Havana reported the sounds hit them at extreme volumes.
Whether there’s a direct relationship between the sound and the physical damage suffered by the victims is also unclear. The US says that in general the attacks caused hearing, cognitive, visual, balance, sleep and other problems.
The recordings from Havana have been sent for analysis to the US Navy, which has advanced capabilities for analysing acoustic signals, and to the intelligence services. But the recordings have not significantly advanced US knowledge about what is harming diplomats.
The Navy did not respond to requests for comment on the recording. State Department spokeswoman Heather Nauert wouldn’t comment on the tape’s authenticity.
Cuba has denied involvement or knowledge of the attacks. The US hasn’t blamed anyone and says it still doesn’t know what or who is responsible. But the government has faulted President Raul Castro’s government for failing to protect American personnel, and Nauert said Thursday that Cuba “may have more information than we are aware of right now.”
“We believe that the Cuban government could stop the attacks on our diplomats,” said White House chief of staff John Kelly.
Not all Americans injured in Cuba heard sounds. Of those who did, it’s not clear they heard precisely the same thing.
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.
“That’s the sound,” one of them said.
The recordings have been played for workers at the US Embassy to teach them what to listen for, said several individuals with knowledge of the situation in Havana. Some embassy employees have also been given recording devices to turn on if they hear the sounds. The individuals weren’t authorised to discuss the situation publicly and demanded anonymity.
Cuban officials wouldn’t say whether the US has shared the recordings with Cuba’s government.
Another big question remains: Even if you know you’re under attack, what do you do?
Still dumbfounded by what’s causing this, the United States has been at a loss to offer advice.
The embassy’s security officials have told staff if they believe they’re being attacked, they should get up and move to a different location, because the attack is unlikely to be able to follow them, the commenting individuals said.
Some diplomats who experienced an attack or heard sounds reported they were narrowly confined to a room or parts of a room.
At least 22 Americans are “medically confirmed” to be affected, the State Department says, adding that the number could grow. The attacks started last year and are considered “ongoing,” with an incident reported as recently as late August.
Cuba has defended its “exhaustive and priority” response, emphasising its eagerness to assist the US investigation. 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.