Chris Hemsworth dropped to 500-calories-a-day diet for 'In the Heart of the Sea'

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Chris Hemsworth Drops Down to 500 Calories a Day for 'In the Heart of the Sea'

Captain Ahab's mortal enemy is getting new life for In the Heart of the Sea, and ET was behind the scenes for the making of the film.

VIDEO: Chris Hemsworth Shows Off His Sexy Dance Moves

Ron Howard's action-adventure movie follows the aftermath of the real-life maritime disaster that inspired Herman Melville's Moby Dick. In the winter of 1820, the New England whaling ship Essex was attacked by a whale, leaving the surviving crew to do the unthinkable to stay alive in the face of storms, starvation, panic and despair.

Chris Hemsworth stars as the vessel's veteran first mate Owen Chase, and he had to drop a good amount of weight to shoot the shipwrecked scenes. The action star goes from "Sexiest Man Alive" to one of the skinniest through a strict, meager diet.

"We have to shoot the really skinny stuff where we drop down to 5, 6, 700 calories a day, a good three or four weeks and it's going to be pretty uncomfortable, but we'll be together in our misery," Hemsworth told ET. "I spend more time thinking about food than anything else at the moment."

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Watch the video to see how the crew shot the epic storm scenes.

In the Heart of the Sea hits theaters Dec. 11.

See photos of Chris throughout the years:

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Chris Hemsworth dropped to 500-calories-a-day diet for 'In the Heart of the Sea'
Chris Hemsworth arrives at the Los Angeles premiere of "Vacation" at the Regency Village Theatre on Monday, July 27, 2015. (Photo by Chris Pizzello/Invision/AP)
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Actor Chris Hemsworth arrives at the premiere of Universal Pictures and Legendary Pictures' 'Blackhat' at the Chinese Theatre on January 8, 2015 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
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Chris Hemsworth is seen on November 19, 2013 in La Gomera, Spain. (Photo by Torsten Laursen/Getty Images)
Chris Hemsworth is a guest on 'Good Morning America,' 11/5/13, airing on the ABc Television Network. (Photo by Lou Rocco/ABC via Getty Images)
Actor Chris Hemsworth is seen outside 'Good Morning America' on November 5, 2013 in New York City. (Photo by Raymond Hall/FilmMagic)
Emmy Award-nominated 'Jimmy Kimmel Live' airs every weeknight (11:35 p.m. - 12:41 a.m., ET), packed with hilarious comedy bits and features a diverse lineup of guests including celebrities, athletes, musicians, comedians and humorous human interest subjects. The guests for MONDAY, NOVEMBER 4 included actor Chris Hemsworth ('Thor: The Dark World'), comedian Artie Lange (book 'Crash and Burn') and musical guest Jane's Addiction. (Photo by Randy Holmes/ABC via Getty Images)
Actors Chris Hemsworth (L) and Tom Hiddleston arrive at the premiere of Marvel's 'Thor: The Dark World' at the El Capitan Theatre on November 04, 2013 in Hollywood, California.AFP PHOTO/JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)
Actors Liam Hemsworth (L) and Chris Hemsworth attend Marvel's 'Thor: The Dark World' Premiere at the El Capitan Theatre on November 4, 2013 in Hollywood, California. (Photo by Alberto E. Rodriguez/WireImage)
Actor Tom Hiddleston (L) and actor Chris Hemsworth attend the 'Thor: The Dark World' Germany premiere at Cinestar on October 27, 2013 in Berlin, Germany. (Photo by Anita Bugge/WireImage)
Actor Chris Hemsworth attends the World Premiere of 'Thor: The Dark World' at Odeon Leicester Square on October 22, 2013 in London, England. (Photo by Gareth Cattermole/Getty Images)
Chris Hemsworth (L) and Tom Hiddleston attend the World Premiere of 'Thor: The Dark World' at Odeon Leicester Square on October 22, 2013 in London, England. (Photo by Dave M. Benett/WireImage)
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Actor Chris Hemsworth attends Meet The Actors at the Apple Store Soho on September 18, 2013 in New York City. (Photo by Jim Spellman/WireImage)
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Actor Chris Hemsworth and comedian Kristen Schaal during a commercial break on September 16, 2013 -- (Photo by: Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images)
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Actor Daniel Bruhl, director Ron Howard and actor Chris Hemsworth attend a photocall for 'Rush' at Hotel de Russie on September 14, 2013 in Rome, Italy. (Photo by Franco Origlia/Getty Images)
Actor Chris Hemsworth attends the World Premiere of 'Thor: The Dark World' at Odeon Leicester Square on October 22, 2013 in London, England. (Photo by Gareth Cattermole/Getty Images)
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