When and where was UFO abduction reported by several male campers who were canoeing one night on a lake...?

Question

And saw a strange light in the sky, decided for kicks to blink "SOS" in morse code at the thing, quickly regretted it...

Answer 1

It was featured on the unsolved mysteries TV show years ago. On August 26, 1976, four men were canoeing on the Allagash waterway in Maine. Read more about it at the link. The blinking is in there, too!