Weekend Gedankenexperiment - The Kill Switch

May I suggest -

A bunker built for Scottish Office staff in the event of a nuclear attack is up for sale.
The complex at Cultybraggan Camp near Comrie, Perthshire, was completed in 1990 and is believed to be one of the most advanced
structures of its kind.
It was built to house 150 people and protect them from nuclear, biological and electromagnetic attacks.