Men were dying behind him, men he was supposed to protect. What he had to do was to solve little trigonometrical problems in his head quickly and accurately, and give his orders calmly, and issue his information intelligibly, and anticipate the submerged U-boat’s movements as freshly and as rapidly as he had done ever since yesterday. He had to be a machine that did not know emotion; he had to be a machine that did not know fatigue.
