In 2015 at Alton Towers in the UK, The Smiler Rollercoaster experienced a major incident leading to severe injuries for multiple riders. We look at how pressure to get the ride running again and mis-communication defeated the system designed to protect the riders.With John Chidgey.Links of potential interest: Alton Towers The Smiler How Alton Towers Smiler Crash Unfolded Alton Towers Smiler Crash Footage Released Alton Towers Smiler Ride Reopens Support Causality on PatreonEpisode Gold Producer: 'r'.Episode Silver Producers: Chris Stone and Eivind Hjertnes.