The film is 4 hours long, but it doesn't feel lengthy in the slightest, and you really feel like you're in this submarine, wandering the bottom of the Atlantic Ocean. There is no political exaggeration in it, it is completely describing the daily activities and encounters of officers and soldiers on the submarine during World War II, so the portrayal of human nature is also quite successful.
World War II can be said to be a continuation of World War I. The harsh terms of the Treaty of Versailles made even the victorious countries feel uneasy, and the treaty ignited the fire of nationalism in Germany. The war reparations brought serious inflation to Germany, and the lives of ordinary Germans were extremely difficult. It was against this background that Hitler advocated that National Socialism could achieve employment for all people, and advocated the use of force to lift the restrictions imposed by the Treaty of Versailles on Germany.
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