https://www.youtube.com/watch?v=Ei30pLIK9_Y
Out of nowhere, amirite?
Looks good, plays great. Above all it has the perfect balance between simulator and game. I've wanted to like past games such as the Silent Hunter series, but they're so simmy you end up spending all your time staring at radar screens and crawling huge distances only to be blown up by an unseen enemy sub. Other games like Battlestations Midway are more fun, but have very shallow gameplay.
I locked a torpedo onto a blue whale once.