Faroes Fumble
A Soviet Surface Action Group, crucially containing the Rocket Cruiser Kirov, has broken out into the North Sea, and is making headway for the GIUK Gap. A single US Submarine, USS Dallas, is the only asset in the area that could meaningfully respond to it.
This mission was inspired by the other custom mission I made in Cold Waters. A simple "kill the big thing with a submarine" type mission.