03/28/2008 02:45 am ET | Updated May 25, 2011

Revealed: How Keira Filmed "Atonement's" Underwater Scenes

Keira Knightley is better known for wearing tight corsets with huge bustles on the sets of period dramas. But as these pictures show, the actress can also take like a duck to water.

Dressed in only a slip and baring all of her thin frame for the cameras, the actress chose to take on her own underwater stunts for the film Atonement.

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