O Barco: Inferno no Mar

The cast was deliberately kept indoors continually during the shooting period in order to look as pale as a real submarine crew would on a mission at sea.

In the bordello sequence prior to the launch scene, swing music was being played. Under Hitler, swing or big band music was forbidden, and only German classical music could be played. However, popular music was common in such service clubs, especially outside Germany proper.

The 5.1 remix for the 209-minute director's cut (for both the English and German dubs) contains entirely new sound effects in place of the sound effects from the original stereo mix. In addition to that, the original Columbia Pictures logo from 1981 featured in the opening is plastered with a silent version of the 1997 Columbia logo instead. The Blu-ray release contains both the original 149-minute theatrical version and the 1997 director's cut on two separate discs, making this release the first time in the US since the VHS and Laserdisc days that the theatrical version has been made available. However, on the disc containing the theatrical version, despite being listed as a 5.1 remix on the case and the menu, it instead contains only the original stereo mix for both the German and English tracks (in addition to restoring the original 1981 Columbia Pictures logo to the opening).

Edited from A Batalha da Grã-Bretanha (1969)