Hunter Killer The U.S. Los Angeles class submarine USS Tampa Bay vanishes as it watches the Russian Akula class submarine Konek in the Arctic. Rear Admiral John Fisk (Common), dispatches the Virginia class submarine USS Arkansas under the command of and unorthodox commander Joe Glass, (Gerard Butler) to look into.
A team of Navy SEALs under the command of Lieutenant Bill Beaman (Toby Stephens), is sent to inspect the Russian naval base in Polyarny (Murmansk Oblast). However their mission gets obstructed when Martinelli (Zane Holtz) who serves as the team’s Marksman, gets wounded in the HALO drop. The Russian officer blindly fires towards their hiding place and kills Martinelli.
In the meantime, Arkansas discovers the destroyed Tampa Bay, and also discovers the sunken Russian submarine Konek damaged in a manner that suggests internal sabotage, not external attacks. Another Russian Akula submarine, Volkov, is attacking them. Glass overcomes the Russian ambusher and saves Konek’s survivors.
Back at base at the Base, the U.S. government learns about the coup. Admiral Charles Donnegan ( Gary Oldman) advises the government to prepare for war, and Fisk suggests the soldiers from Arkansas be assigned to join with Beaman’s group after they have successfully saved Zakarin. Glass gets Andropov to aid. Glass moves through Arkansas near the base, unnoticed due to his experience in the difficult submerged terrain as well as the minefield. While Beaman’s team is helping to save Russian Presidential Security Service Agent Oleg ( Yuri Kolokolnikov) who was earlier killed by Durov’s men as they tried to prevent Durov from taking the President Zakarin hostage. They enter the base, where they are successful in rescuing the president Zakarin. But, Oleg and his two coworkers, Devin Hall ( Michael Trucco and Matt Johnstone [ Ryan McPartlin and Matt Johnstone [ Ryan McPartlin]], are killed in the rescue. Martinelli was the cover fireman when Beaman handed over the president to Arkansas. The deep submergence rescue vehicle followed. Martinelli was planning to take down Beaman alone, but Beaman saved him just before he returned.
As the U.S. and Russian fleets are preparing for battle, Arkansas sustains further damage when they are attacked by Andropov’s old ship RFS Yevchenko–a heavily equipped destroyer now under the command of Captain Vlade Sutrev ( Ilia Volok) and an accomplice to Durov’s plot. Andropov can issue a confirmation message that the president Zakarin is aboard the submarine. Glass is unable to take action in the event that Durov has his troops ordered by the base to shoot missiles at the Arkansas. He realizes that firing on the Russians could spark the war he wishes to be ended. In the closing minutesof the battle, the Andropov’s former crew members resist orders and take out the approaching missiles with the close-in weapons system, before they strike Arkansas and then destroy Durov’s naval base headquarters with the missiles. The war has been averted. Glass will dock Arkansas with the Russian naval base in order to return Zakarin and the remaining crew members of Andropov back to their homes. Arkansas is able to pick up Beaman and Martinelli and returns back to the U.S. with a Russian Navy accompanying them.