THE scuba divers couldn't believe it. They were teaching Daniel Radcliffe to swim underwater for the new Harry Potter movie - and now their teenage charge was signalling he was drowning.
The crew were underwater, in the middle of training for one of the hardest stunts in Harry Potter and the Goblet of Fire, when Daniel made the emergency hand signal that he was in big trouble.
The fourth film sees a more grown-up Harry taking part in the tough Triwizard Tournament.
And for the tournament's second task, Daniel had to get more than a bit wet.
To make it look like Harry has turned himself into a fish, Daniel had to learn to hold his breath underwater for long enough to film entire clips.
All was going well until Daniel was motioning that he was drowning.