Silent Service: The Submarine Simulation

Set your difficulty/realism level and time period (early means less tech for juicier targets, later means tougher escorts, more tech, lousier targets). Contend with factors like dud torpedoes, maximum depth, and more. You can choose among practice run against some old hulks, recreate historical convoy attacks, go on a single patrol, or go on your own campaign, which lets you go multiple patrols until you die, get promoted, or survive the war. How well will you do when matched against history?