Even though impressed by the technological accuracy of the film's set-design and port construction buildings, novelist Lothar-Günther Buchheim expressed great disappointment with Petersen's adaptation in a film review published in 1981, describing Petersen's film as converting his clearly anti-war novel into a blend of a "cheap, shallow American action flick" and a "contemporary German propaganda newsreel from World War II". He also criticised the hysterical overacting of the cast, which he called highly unrealistic, despite their talent. Buchheim, after several attempts for an American adaptation had failed, had provided his own script as soon as Petersen was chosen as new director. It would have been a six-hour epic; Petersen turned him down because the producers were aiming for a 90-minute feature for international release. However, today's Director's Cut of "Das Boot" amounts to 207 minutes.