After an American sub ventures into Russian waters responding to a ship in distress-and winds up on the ocean floor itself-Commander Joe Glass (Gerard Butler) draws the dicey duty of leading the investigative voyage. Dealing with literal treacherous waters as well as diplomatic tides, he discovers that the naval disasters may be part and parcel of an audacious power grab at the Kremlin. Throwback thriller also stars Gary Oldman, Common, Linda Cardellini, Toby Stephens, Michael Nyqvist. 122 min. Widescreen; Soundtrack: English.