They made a shelter out of their rowboats and survived by eating seal and penguin meat. They didn't stay very warm at all. I imagine their heat sources were bod

They made a shelter out of their rowboats and survived by eating seal and penguin meat. They didn't stay very warm at all. I imagine their heat sources were body heat and fires fueled by seal blubber. Source: I read Alfred Lansing's book Endurance about 25 years ago, and skimmed the Wikipedia page just now, so as you can tell I'm something of an expert.