Life on a submarine may, to many people, sound fascinating. However, it is, in fact, horribly boring. Except for the commanding officers, a day aboard a submarine consists of six hours on duty, six hours off, day after day, for months. This being the case, every effort is made to ensure that the lives of the men are as pleasant as possible. The meals are exceptionally good, and there is a daily film, shown at a specific time, on television around the submarine. In return, the crew is always expected to perform perfectly all the time. A mistake is quite unforgivable. In fact, a favourite saying is “There’s room for everything on a submarine except for a mistake".