What movie is the most historically accurate

Das Boot is widely praised for its historically accurate portrayal of life aboard a German U-boat in World War II. Drawing on Lothar-Günther Buchheim’s novel (which itself was informed by his wartime experiences), the film captures the cramped, claustrophobic environment, the crew’s routines and tensions, and the psychological strain of prolonged patrols. Technical details — such as the U-boat’s layout, sonar and radio procedures, torpedo attacks, and damage-control maneuvers — are rendered with careful attention, and the film avoids romanticizing combat, instead showing the grinding boredom, fear, and moral ambiguity sailors faced. Director Wolfgang Petersen’s emphasis on atmosphere, sound design, and realistic performances contributes to its reputation among veterans and historians as one of the most faithful cinematic depictions of submarine warfare. References: L.-G. Buchheim, Das Boot (novel); reviews and analyses by naval historians and veteran testimonies (see e.g., Paul Stillwell, “U-Boat Crews and Life at Sea,” and contemporary film-historical assessments).