 A satellite re-enters the atmosphere and ejects a capsule, which parachutes to the Arctic, approximately 320 miles northwest of Station Nord, Greenland in the Arctic Ocean ice pack.A person approaches, guided by a homing beacon, while a second person secretly watches from nearby.The scene shifts to Commander James Ferraday, captain of the fictional American nuclear attack submarine USS "Tigerfish" (SSN-509) stationed at Holy Loch, Scotland.