Check Out Chris Hemsworth's Dramatic Weight Loss

— -- Chris Hemsworth has gone from superhero to shipwrecked.

The "Thor" actor posted a snapshot via Instagram on Sunday, showing off his dramatic weight loss for the upcoming film "In the Heart of the Sea," in which he plays a man stranded in the Pacific Ocean for 90 days.

"Just tried a new diet/training program called Lost At Sea" and "wouldn't recommend it…#IntheHeartoftheSea," the 32-year-old actor said.

The Australian hunk, recently shared how he went on a strict diet in order to shed pounds for his role as Owen Chase, the first mate of the 1820s whaling ship Essex, which was taken down by a massive whale, stranding the crew for 90 days at sea.

"Throughout the shoot, each week or two we’d reduce the calories, down, down until, we were at about 500 or 600 calories a day for the last couple weeks," he told Nightline recently during a sit-down with the actor and the film's director Ron Howard. "I can’t say that I want to do it again, I read things now and if it has any mention of being skinny, I’m like that’s a pass."

He continued, "Transforming physically had such an effect on us emotionally, which we were all going through. It kind of bonded us, in a way that I think we wouldn’t have gotten otherwise. You know, we felt like it was us against the world, or us against anyone who was well fed."