Captain Crozier descends the short ladder to the lower deck, pushes through the sealed double doors, and almost staggers in the sudden blast of warmth. Even though the circulating hot-water heat has been off for hours, body heat from more than fifty men and residual warmth from cooking have kept the temperature here on the lower deck high—just below freezing—almost 80 degrees warmer than outside. The effect on someone who’s been out on deck for half an hour is the equivalent of walking into a sauna fully clothed.