> They went to the origin of the signal, only to find a computer turning on and off because of its solar panel, sending messages at every boot. In the original

> They went to the origin of the signal, only to find a computer turning on and off because of its solar panel, sending messages at every boot. In the original film [0] and book, the signal is caused by a soda-bottle being knocked by a window-blind against a Morse-code telegraph key. [0] https://en.wikipedia.org/wiki/On_the_Beach_(1959_film) https://en.wikipedia.org/wiki/On_the_Beach_(1959_film)