I happened to see these when I logged into GOG before coming here today and immediately bagged them. After a few quick plays, it is amazing to see how far subsims have come in almost 30 years. I also find it surprising that none of the newer sims model worrying about chlorine gas from damaged batteries, which Silent Service II does model. I remember playing Silent Service on the NES when Konami/Ultra ported it over to the system. Good times.
