Adapted from the autobiographical novel of the same name by German World War II photographer Lothar-Günther Buchheim, Das Boot, tells the thrilling journey of the fearless U-shaped submarine captain (played by Jürgen Prochnow) and his young crew members performing dangerous patrol missions in the Atlantic and Mediterranean.They were sometimes hunters, quietly tracking allied ships; sometimes they became prey, struggling to survive in the deep sea.The film not only shows the cruelty and tension of war, but also deeply depicts the tenacity and fragility of human nature in the extreme environment, as well as the brotherhood and destiny that quietly grows among the cold steel bulkheads.