Boyfriend of Vanessa Hudgens and the hunky lad of ‘High School Musical’ fame, Zac Efron is currently being run in the cinema halls via his film ‘Charlie St. Cloud,’ his 1st big attempt at the drama genre.

Zac Efron shares one of his scary experiences while shooting for the film. He reveals how frightening it was for him to shoot an underwater sequence. In the climax of the drama, he had to film an underwater scene which shook the soul out of him as he was utterly petrified. The role demanded that he stayed under water for nearly 15 minutes; something that was extremely frightening since he could hardly see anything.

Recalling that experience, he shudders, “It was one of the most surreal experiences. In (watching) movies growing up whenever I see underwater scenes I always assumed they somehow figured out a way for actors to breathe underwater. The actual challenge of being underwater for minutes at a time and moving from oxygen tank to oxygen tank is so hard. I would be submerged for like 15, 16 minutes at a time. It’s really nuts, that was really hard to do. You can’t see anything!”

However, Zac has got his hopes pinned on the film and is happy with the way this film has helped him test his versatility and mental strength. [Source]