"First, it was just one missile, but then another, and another, until the system reported that a total of five Minuteman ICBMs had been launched."
Happy Stanislav Petrov Day, fediverse!
(From 2018) https://www.vox.com/2018/9/26/17905796/nuclear-war-1983-stanislav-petrov-soviet-union
The Soviet early warning system that day was only 3 weeks old - they hadn't even finished testing it before Petrov's shift.