An ominous disaster forces five survivors to wait out nuclear winter in a secret underground bomb shelter. With limited supplies and nowhere else to go, the group struggles against the clock until it's safe to return to the surface. As weeks turn into months, one room proves too small for five people. Social norms break down in their one-room civilization where privacy is extinct. Habits curdle into routine, relationships dissolve, obsessions give way to madness. Trapped not only with each other but with the consequences of their actions, the survivors must ask themselves: Is their underground life worth preserving at all?