is an epic work of Wolfgang Petersen that tells about the life of the crew of the German submarine (U-boat) during World War 2. The film is considered a masterpiece because of its success in portraying claustrophobia atmosphere of the crew members who has to spend a long time living inside a submarine, isolated from the outside world. In my opinion, we should acknowledge Wolfgang Petersen’s skill in depicting boredom and a sense of alienation in careful details, as if the audience can actually feel what they feel. Wolfgang Petersen managed to get rid of boredom with the monotony of the audience in witnessing a setting that only takes place in a submarine by carefully building up the tension in every scene and, again, this is very great.
"The bulk of the film’s $15 million budget was spent on constructing U-boats. Specifications for the original Type VII-C U-boat were found at the Chicago Museum of Science and Industry. The plans were taken to the original builder of the subs, who was commissioned to build a full-sized, sea-going replica, their first such assignment since the war ended. A second full-sized model was built for interior filming. Three scale models were built for special effects work. The first, a 35 foot remote controlled model, could sail in high seas and dive; the other two, 18 feet and 8 feet in length, were used for underwater shots. Scale models of tankers, destroyers and other ships were also built to complete the armada" - imdb