The Cruiser's commitment to in-camera stuntwork is well-known by this stage, and everything so far about 'Mission: Impossible - Fallout' seems to suggest that he's not only going for broke, but that's he actively putting his body on the line for this movie.
As this behind-the-scenes featurette explains, Cruise - who's turns 56 next month - hurled himself out on airplane at 25,000 feet to complete a HALO jump. HALO, by the way, stands for High Altitude / Low Opening and is usually reserved for military operations where personnel or equipment and supplies is being inserted into a radar-monitored area where parachutes deploy as low as 600 metres off the ground after a free-fall at terminal velocity.
Just to highlight further how dangerous HALO jumps are, people typically spend up to 45 minutes breathing in pure air to prevent hypoxia. You do a jump without it, and there's a better-than-average chance you'll black out in the middle of jump and, well, plummet to your death without the parachute deploying.
So, uh, yeah. Not good. Here's how they did it in 'Mission: Impossible - Fallout'. The film parachutes in (heh) to Irish cinemas on July 27th.