Zac Efron Hated Underwater Scenes in New Movie

Zac Efron struggled to film underwater scenes for his new movie Charlie St. Cloud - because he was submerged beneath the surface for up to 15 minutes at a time.

The High School Musical star found it difficult to shoot the dramatic scenes for the climax of the drama and he's keen never to repeat the experience.

He tells BBC Radio 1, "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!"