Chris Hemsworth has revealed he was passing out between takes after doing a "crazy diet" for latest flick The Heart of The Sea.

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You'd think getting ripped Thor-style would be the most physically challenging thing the actor has been through, but it was actually dropping the pounds that pushed him to his limits.

“It was a crazy diet and sometimes when ‘cut’ was called you would literally pass out from exhaustion," Hemsworth told Graham Norton.

Hemsworth certainly surprised his fans when he posted this picture online:

“It was the most physically challenging thing to do," he admitted.

The film, directed by Ron Howard, charts the life of crewmen who are left struggling to survive after a mammoth whale attacks their ship. The tale is said to have inspired Herman Melville to write Moby-Dick.

Howard himself admitted it was quite the undertaking.

“Directorially, it was the biggest of challenges, but I have an ambitious streak that I just have to follow. It’s a life experience making this type of movie – I’m not naturally adventurous as a person and these movies take me to places and experiences that I wouldn’t otherwise have.”

In The Heart of the Sea is released in cinemas on 25th December.

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