I was in the mood for a good sub movie. This is not a good sub movie.
The movie opens with a US hunter-killer sub stalking a Russian sub in the Barents Sea, just off the Russian northern coast. Both are ruthlessly blown up! The USS Arkansas, under the command of new captain King Leonidas (Gerard Butler) is sent to surreptitiously investigate. Meanwhile a SEAL team is sent to the area to investigate strange goings on at the nearby Russian Navy base. Before you can say "I wish Sean Connery were in this movie", a nefarious plot is revealed: a no-goodnik wants to depose the nice-guy Russian president and (probably) start a war with the US. Or something. I'm pretty sure I dozed off while the plan was described.
The SEALs and the sub crew engage in some major operations to rescue the Nice Russian, foil the plot, all while avoiding escalating the violence to all-out war. Lots of shooting, explosions, even fisticuffs; you'd be surprised at how boring this can be.
Gary Oldman is wasted as a hotheaded Chairman of the Joint Chiefs of Staff. Linda Cardellini brings her two X chromosomes to try to calm him down.
Looks as if they spent a lot of money on the special effects and sets, but … you gotta do more than that.