Find out what goes on behind the scenes in the realm of nuclear power. For more than 50 years, this huge underground facility, situated just on the outskirts of a quiet Cheshire village, was a well-guarded secret. The 35,000 sq ft subterranean bunker, which was declassified in 1993, would have served as the regional government’s nerve centre in the event of a nuclear attack. The bunker currently welcomes visitors who are seeking something a little unusual to do on their day out.