Icebreaker L-D39 suffers a nuclear reactor malfunction. You must reach safety before the crew freezes to death. Conserve energy, but keep moving, or your ship will be trapped in ice; maintain sane heating levels so your crew doesn't get sick; every once in a while reroute power to the galley to supply enough food; make sure any injury or sickness receives adequate treatment in the sick bay. And always remember that overloaded reactor degrades faster.