For sheer mileage, Das Boot is the pinnacle in achieving so much with limited confines. A kind of depth-charge assault that refuses to let up until its visceral climax.
Most of its expansive runtime is spent on the U-Boat (specifically, a crew of 50 men who are cramped inside a sub) and director Wolfgang Petersen always maintains a seat-grabbing relentlessness.
He uses a fly-on-the-wall doco approach as the Germans deal with the tedium of waiting. All culminating to the veracity of battle and the exasperation of near death.
At the height of WWII, they're put on a top-secret mission and ensured that few will return home. Ordered to patrol the Atlantic and destroy an allied armada (which is bringing supplies…