Here's the story of a Royal Navy cruiser that was heavily damaged by enemy fire, and rendered useless by seven men -- all crew members of the cruiser itself.
It's a flatly narrated movie produced at Ealing studios for viewing by Royal Navy personnel, illustrating the small things that loyal and able sailors and officers did to cause disaster. It's not very interesting in its presentation, but it is worth while following for the people who were assigned to shipboard duties to war, when a hole in the hull could damage a ship, and the carelessness of its crew could render it worthless, a floating hulk, or even sink it.