This is a Polish podcast so remember to turn on translation.
But in short: in 1979 Polish fishing vessel Hel 127 spotted strange objects in Baltic Sea. When one object (hovering above the sea) began pulsating, fishermen felt very weak and paralyzed, especially the captain who temporarily lost sight. Other ships witnessed the scene and the case was oficially examined by Polish Navy. It's very interesting when comes to Garry Nolan's research and Havana Syndrome.
Original link: https://youtu.be/pd7q_i8hXaw?si=PJOqd4Y6iW1R8ZhL
by sasula_99