^ While "Das Boot" is one of the better representations, i would not take it as face value or evidence, e.g. thinking of the rivets giving in during an attack
While some parts were riveted, the all-welded pressure hull was not.
Buchheim was "Kriegsberichterstatter", an "embedded" war reporter. And while he understood most things right, he was not a real learned U-Boat man, let alone what they did to his book in the film.