Jack, Christopher Henderson, and McCullough entered the Russian submarine Natalia with the help of Petty Officer Tim Rooney, to stop Vladimir Bierko and his Dawn Brigade men from hijacking the missiles within. Inside, McCullough helped Jack (with the use of a signaling mirror) to kill Bierko's technician who was programming the missiles before launching them. This allowed Henderson to shut down the missile system and avert another crisis. Jack and McCullough then searched for Bierko and his remaining men, but McCullough was shot by one of them. This shooter was killed by Jack, as were Bierko and his last remaining henchmen.