Cold Waters is a great game, one of my favorites. It is new so compatible with new systems and all resolutions. Allows you to play with a wide variety of cold war subs. Has a great and very replayable campaign game. Good combination of fun and realism. Also very easy to mod so you can make it as tough as you want. Highly recommended.
Dangerous Waters is also good, but getting on the old side. Campaign is just a series of scripted missions. Only real advantage is that you can man the various stations and do everything manually, i.e. detection, classification, TMA, etc.
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