Since leaving the SAS, Ryan wrote "The One That Got Away", which tells his account of the Bravo Two Zero mission. Both his and McNab's accounts have been heavily criticised by former SAS member and explorer Michael Asher, who retraced the patrol's footsteps and claimed to have largely debunked both accounts as well as the then-SAS regimental sergeant major Peter Ratcliffe and the other surviving members of Bravo Two Zero in their own published accounts, as largely fictionalised versions of events.