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.

There were times I would pass out physically; I was unable to get back into the cockpit," Cruise says.Is there anything Tom Cruise won't do while filming the Mission: Impossible movies?The action star has made it clear that he'll try anything to get the stunts right in his long-running franchise.