Wolfgang Petersen’s 1981 breakthrough Das Boot about a WWII German U-boat crew patrolling the Atlantic was remarkable for its bold decision to contain almost all of the action within the submarine’s claustrophobic interior, putting the audience under as much tension as the ship’s creaking hull. Now, 30 years later, the movie gets plenty of room to breathe with its Blu-ray debut on a 2-Disc Collector’s Set (R). The HD transfer of the 31/2-hour director’s cut is so crisp you can see the dirt in the crew’s unkempt beards. There’s also a bevy of new EXTRAS, like a guided tour of the set and a retrospective documentary with Petersen and star Jürgen Prochnow. Both help ensure that your time and money are well sunk into this battleship of a release. A?