Launches & rockets · first seen 12 Aug, updated 12 Aug
In September 1983, a Soyuz rocket caught fire on the pad with two cosmonauts strapped in above it, and the flames burned through the cables carrying the abort command. Saving them came down to two controllers pressing their buttons within five seconds of each other
A catastrophic launch pad fire severed the only abort command to two trapped cosmonauts—until a forgotten backup system became their sole chance at survival. The post In September 1983, a Soyuz rocket caught fire on the pad with two cosmona…
Summary from SpaceDaily.