Castlemaine's convoy routine demanded endurance and alertness

Castlemaine's crew worked in cramped spaces aboard a ship that offered little comfort in heavy weather. Constant zigzagging and responses to possible ASDIC contacts added to the motion, and sailors could become seasick until they grew accustomed to it. The work often lacked the visible action of destroyer service, but leaving convoys unescorted would expose shipping to submarines. Long, repetitive days created a separate readiness problem. Chiefs and officers had to keep sailors active and engaged so that routine did not dull their reactions when a real emergency arrived.