Das Boot
Production
Production of Das Boot took two years (1979–1981) and was the most expensive German film at the time. Most of the filming was done in one year; to make the appearance of the actors as realistic as possible, scenes were filmed in sequence over the course of the year. This ensured natural growth of beards and hair, increasing skin pallor, and signs of strain on the actors, who had, just like real U-boat men, spent many months in a cramped, unhealthy atmosphere.
Sets and models
Throughout the filming, the actors were forbidden to go out in sunlight, to create the pallor of men who seldom saw the sun during their missions. The actors went through intensive training to learn how to move quickly through the narrow confines of the vessel.
Release
The film opened on 17 September 1981 and received a very wide release in West Germany, opening in 220 theatres and grossing a record $5,176,000 in the first two weeks. It became the highest-grossing German film in Germany.