Part of the Nazi film series "Die Frontschau" (The Front Show), produced for and shown only to German troops, supposedly to prepare them for the 1941 assault on Soviet troop positions. Numer 9 in that series.
Never shown to the German public during WWII. The whole film series was censored from public screening.
Full title is "Construction of Positions and Shelters for the Fighting Troops or Those in Rest Areas."