I’m breathing in my own carbon dioxide. It builds up in the body and affects the muscles... You have to overcome all of that while you’re doing it, and be present.

Tom Cruise told Empire magazine that he breathed in his own carbon dioxide while filming a grueling action set piece for the upcoming “Mission: Impossible – The Final Reckoning.” The sequence finds Cruise’s Ethan Hunt underwater exploring the wreckage of a submarine.

Tom Cruise’s dedication to practical stunts reaches new depths in Mission: Impossible – The Final Reckoning, with Empire magazine revealing the actor risked hypoxia while filming an intense underwater sequence.