No ships were sunk from what I understand (and im pretty sure there wernt) so we would have a fake campagine which would get boreing after a while, Veary fiew to no Info on the inside and the subs there selfs, cause they wanted to keep every thing secret as possiable. Also UBI already has the stuff left over from SH3/4 that would make it easyer on them. I dont know about you all, but a Cold War campagine would bore me, Almost everything operated by computers.