RTE Ultimate Hell Week finalist David Gillick said he suffered from PTSD after filming the show - waking up in night sweats and dropping around 5kg in weight.
Of the 20 recruits who started the course, the Irish Olympic runner was one of just three famous faces to have made it through the gruelling special forces selection course.
But the champion athlete admitted it was tougher than he ever could have imagined, and recalled the shock on his wife’s face the day he returned home from the gruelling week of filming this summer.