SJ Beard and Paul Ingram were guests on a special episode of the BBC Radio 4 documentary programme Sideways looking at the risk of nuclear war. In episode Exiting the Bunker Matthew Syed examines the current nuclear landscape. In this complex, multiplayer context how do we create a safer world? Entering the worrying world of nuclear modelling Matthew hears about research that suggests the threshold for catastrophic nuclear damage is lower than we might think. He also asks whether we can reconcile different ideas about how to contain nuclear weapons, wake up and regain agency, to chart a path to a safer future.