The funny thing is that I stopped playing FPS games like Battlefield 4 and have gone back to playing V4V, Harpoon and Close Combat. It is much less stressful (until I spot a red torpedo).
The subs in the most recent Harpoon is almost undetectable, at least by air anyway.
And it is gone. I'm not sure why it is gone. It didn't seem to cost them anything to have it available. If we are lucky, gog.com will get it.
And it is back
http://www.matrixgames.com/store/392/Larry.Bonds.Harpoon.-.Ultimate.Edition
I bought it today for $15. I used to play it with my 2 year-old daughter on my knee. Every time a missile would hit, she'd say "Bango" so that became the name of the game.
She turns 24 in January.