Transcript for Inside Ron Howard's 'In the Heart of the Sea'
So if you've already seen "Star wars" you may want to check out "In the heart of the sea." Ron Howard's epic movie tells the story that inspired "Moby dick." ABC's Rachel smith caught up with the stars. It's the sweeping sea faring epic tale. Of the ill-fated nantucket ship "The Essex" sunk by a whale in 1820. This true story was the inspiration for the novel "Moby dick." Top of the loft. Take the helm. Reporter: In "In the heart of the sea" stars Chris Hemsworth, Benjamin walker and Tom Holland as "Essex" crew members hunting for whale oil. Seems like you had a bonding thing. We all starved together, didn't we? Yeah, something about suffering that brings you close together. Reporter: To convincingly play starving men adrift at sea for months they all went on a highly restricted diet. I'd love to know what the conversation was like in between takes on set. Food. Food, really. Always. It got catty. There was a lot of like did you see ed had a cheeseburger last night. Did he eat a piece of chocolate? Yeah. Prepare to abandon ship. We can't roll away home. Reporter: Because it was such an intense diet, did that help you get into character even more? I think like when you change your physique you're like embodying a new person so half the job is done. As I live and breathe he's mine. I was? Us fascinated by the story and why some men choose to defy all odds and push. These guys are going out for years on end on these voyages to get whale oil. Are they ego driven, brave? I think a lot didn't have a choice. That was the industry and it was like going off to war. This he didn't come back, some of them a lot of the time. And it was the only way to light the lamp in your house really so it's easy to be judgmental of them but they were working with what they knew. Do you guys have a greater respect for nature after this film? Massively. Oh, yes, especially the sea. Oh, man, I'm not going back to sea any time soon. We were cursed. Reporter: For "Good morning America," Rachel smith, ABC news, New York. And "In the heart of the sea" is in theaters right now.
This transcript has been automatically generated and may not be 100% accurate.