The piercing sound was so loud that night it awoke the official assigned to the US embassy in Cuba who was trying to sleep at home in Havana. Intense pressure to the face followed the stabbing noise as the civil servant ached in pain with nausea and dizziness.
When the mysterious commotion in the dark of night stopped, the symptoms didn’t go away and the dizziness and trouble concentrating lingered, making it hard to continue working at the embassy.
What exactly happened that night in Havana in 2016 is not known, but the same thing started occurring to other embassy staffers and US intelligence officers in Havana and elsewhere. Read more in Medscape.