Hunter Killer The U.S. Los Angeles class submarine USS Tampa Bay vanishes as it shadows the Russian Akula class submarine Konek in the Arctic. Rear Admiral John Fisk (Common) sends the Virginia-class submarine USS Arkansas, under the commandership of newly promoted and unorthodox Commander Joe Glass (Gerard Butler) to conduct an investigation.
In the meantime, a Navy SEAL team under the command of Lieutenant Bill Beaman (Toby Stephens) is sent to observe the Russian naval base in Polyarny, Murmansk Oblast, but their mission is jeopardized in the event that Martinelli (Zane Holtz) Martinelli, the team’s newly Marksman, the team’s designated recruit becomes injured during the HALO drop. The team arrives at the naval base to watch the defense minister, Mikhail Gorevoy performing an attempted coup of etat as well as the taking of Russian president Nikolai Zakarin Alexander Dyachenko prisoner. Their location is nearly recognized by Russians during a radio intercept surveillance however the SEALs are able to escape detection. Martinelli is shot in the leg by a Russian officer who fires blindly towards their hiding spot, forcing the team members to leave Martinelli.
Arkansas discovers the wrecked Tampa Bay and the sunken Russian sub-marine Konek. This suggests that the attack was internal and not external. They are also attacked by another Russian Akula submarine, Volkov, that has been hiding under an iceberg, but Glass can destroy the ambusher, and also rescue Russian survivors from Konek and its crew, including the captain of Konek, Captain 2nd rank Sergei Andropov ( Michael Nyqvist).
The incident is discovered by the U.S. government back at base. Admiral Charles Donnegan ( Gary Oldman) advises the government to prepare for war, and Fisk recommends the troops from Arkansas be assigned to meet with Beaman’s team after they have rescued Zakarin. Glass gets Andropov to assist. Glass navigates Arkansas close to the base, unnoticed due to the expertise of Andropov in the treacherous underground terrain and minefield. In the meantime, Beaman’s team saves Russian Presidential Security Service Agent Oleg ( Yuri Kolokolnikov) who was earlier shot by the Durov’s men as he attempted to stop Durov from holding Zakarin hostage. They enter the base which is where they manage to save President Zakarin. However, Oleg and his two colleagues, Devin Hall ( Michael Trucco and Matt Johnstone [ Ryan McPartlin and Matt Johnstone [ Ryan McPartlin]], are killed in the process. With Martinelli providing sniper cover fire, Beaman delivers the injured president to Arkansas‘s deep-submergence rescue vehicle and then returns with only Martinelli and saves him right before he’s scheduled to be executed.
The Russian and U.S. fleets are preparing for the battle. Arkansas suffers more harm when they are attacked by the RFS Yevchenko the heavily armoured destroyer currently commanded by the captain Vlade Sutrev ( Ilia Volok), who is a part of the Durov’s plot. However, Andropov can communicate a message that confirms that the President Zakarin is on board. Glass does not act in the event that Durov orders his troops at the base to launch missiles into the Arkansas. He is aware that firing at Russians could result in the war he wishes to be ended. In the final moments, the old Andropov crew members defy orders and destroy the coming missiles using the close-in weapon system before they hit Arkansas, and later destroy Durov’s military base headquarters using their missiles. With the war averted, Glass is able to dock Arkansas with the Russian naval base to return Zakarin and the remaining crew members of Andropov to their country. Arkansas takes Beaman, Martinelli and then goes through the U.S.A. with an Russian Navy escort.