"The theme park carried out research before starting work on the ride, which revealed 75 per cent the population have a phobia of being trapped underground and as many as one in five adults are scared of the dark.The ride, based in the Forbidden Valley, goes deep underground into a system of hidden caves. Guests will be able to leave via a "chicken exit" if they find the experience too frightening."Link - http://www.thisisstaffordshire.co.uk/Alton-Tower-s-Nemesis-Sub-Terra-ride-given-12A/story-15567949-detail/story.html