The upcoming movie Dunkirk tells the story of a famous World War II battle from three perspectives: land, air and sea.

Entertainment reporter Kim Holcomb chatted with Mark Rylance, Jack Lowden and Barry Keoghan about their experience on a boat, and the best way to appear “natural” while shooting scenes on the water.

Dunkirk is rated PG-13 and opens everywhere on July 21.

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