It’s worse than that. It’s EVERYONE blacking out SIMULTANEOUSLY for about 2 minutes.

Systems would continue to work as they were set at the time of the blackout, and yes – this could result in people slumping over controls.

On the London Underground, for instance, very little is likely to go wrong as the trains have a “dead man’s handle” which stop the train if the driver fails to keep it set correctly. But of course you can’t do that if you’re more than a few feet off the ground, without causing severe “headaches”.