The Havanna Sound.

[Lummy]

This topic promoted from the Paranormal Cryptozoology Supernatural Conspiracies forum to a place in a more prestigious home, where it belongs.

Because it ain't just for paranoids anymore.

Brain trauma and real injury from unseen, unknown sources:

In late 2016, diplomats at the U.S. Embassy first began noticing health symptoms that they associated with mysterious sounds heard in their homes. Later, diplomats reported similar incidents at two Cuban hotels. Some diplomats described a directional beam of sound. Among the words used to describe it were “buzzing, grinding metal, piercing squeals and humming.” http://www.miamiherald.com/news/nati...200183269.html

In the months that followed, dozens of U.S. diplomatic staffers — as well as some Canadian personnel — began to suffer from a series of health problems, ranging from headaches, sleep disturbances and memory problems, to hearing loss and difficulties with balance. Eighty staffers and family members returned to the U.S. for medical examinations, and 21 of them were evaluated further by the University of Pennsylvania's Center for Brain Injury and Repair ...

Whether or not the diplomatic workers were subjected to a sonic assault, medical and scientific researchers have found increasing evidence that sound — including frequencies that cannot be heard by humans — is linked to a variety of health problems. https://health.howstuffworks.com/hum...s-you-sick.htm

Indeed, you don't have to look into this very far to find probable explanations that go back many years -- as long as there have been tin foil hats, in fact.

This stuff is certainly in the US military arsenal, being refined daily.