Chris Hemsworth reveals that there was no smooth sailing filming “In the Heart of the Sea.” In the drama, which is based on true events that occurred in 1820, he portrays Owen Chase, a member of a hunting crew on the whaling ship Essex that was rammed and shipwrecked by a nearly 85-foot whale. The damning encounter left the men languishing at sea for 90 days. Hemsworth underwent a dramatic weight loss transformation to look the part of a castaway.