More then enething, this game needs Multiplayer. Cold Waters in multiplayer whould be Incredible
.
It also needs Frendly AI, if nothing else in the form of frendly AI subs that randomly somethimes apere in campagne missions. This way it become Incredible importent to identefy contacts.
Also, mabe a editor to create singel player missions and campagnes, whit Your own brifing and storry missions.