During the supposed-to-be-fun expedition, DiCaprio's oxygen tank failed. Fortunately, Norton noticed his issue and shared his tank with the Oscar winner while they swam back to the surface.
"So we go down and we see 300 Eagle Rays and Spotted Rays and it was an amazing dive," Fisher Stevens, the director of DiCaprio's new climate change documentary "Before the Flood", told GQ. "Leo bolts away with Sylvia and Edward goes in front of me and the next thing I know after 20 minutes I’d lost them all."
"Then I see Leo buddy breathing because Leo’s tank was leaking oxygen and Edward have to save him! It was pretty crazy. But he actually did get some film for me and it was good for a second and then it got pretty shaky when he couldn't breathe," he added.