Part 4, Chapter 1 in The Gulag Archipelago Abridged talks about this PRECISE thing. "One’s own order to oneself, “Survive!,” is the natural splash of a living person. Who does not wish to survive? Who does not have the right to survive? Straining all the strength of our body! An order to all our cells: Survive! A powerful charge is introduced into the chest cavity, and the heart is surrounded by an electrical cloud so as not to stop beating. They lead thirty emaciated but wiry zeks three miles across the Arctic ice to a bathhouse. The bath is not worth even a warm word. Six men at a time wash themselves in five shifts, and the door opens straight into the subzero temperature, and four shifts are obliged to stand there before or after bathing—because they cannot be left without convoy. And not only does none of them get pneumonia. They don’t even catch cold. (And for ten years one old man had his bath just like that, serving out his term from age fifty to sixty. But then he was released, he was at home. Warm and cared for, he burned up in one month’s time. That order—“Survive!”—was not there….)"