Pretty good game if I may say so. Has some interesting concepts, good depth in gameplay due to research of technology, capturing enemy subs/buildings, noticable differences between factions and even stuff like mines, mobile defense towers and weapons of mass destruction.
Also the aliens look kinda cool.
I managed to run the game on my Win7 64bit, with a few workarounds (had to end explorer.exe to fix colors and the game has low fps unless I change it's resolution in the mission, then it works fine until I load a new mission).
This game is an abandonware.
I put some effort into finding information about it, and from the look of it, it is no longer sold by anyone.
Steam, GOG, or anyone else don't sell it. Only way how you could get it is to buy used copy on ebay (which is quite pricy for such an old game) or pirate it.
The publisher - Strategy First, doesn't even acknowledge on their site that they know anything about this game's existence. They sell there all their games, but Submarine Titans is not there.
The developer - Ellipse Studios, is nowhere to be found. They had a website, but that seems to not work anymore. Only information I was able to find about them I could quote from here http://www.ign.com/companies/ellipse-studios:
There is also their contact information, but I don't have the curage to dig deeper .Ellipse Studios is an Australian based game development company who specializes in creating real-time strategy games. Two games they have developed in the past are Ancient Conquest & Submarine Titans.
Okey, and what about players? From the look of it, the game is not play much. I found only one fan site (http://www.submarinetitans.com/), there is not much information anywhere, only some on moddb or gameFAQs.
I tried to put that fan site into waybackmachine.org and found out that this url was used for a web site about that game in 2000, then in the next few years it probably has been taken down and recently (July 2015) someone used that url and put up this little site on it.
So, next time you will think about how underrated Original War is and how rough it had in the world, remember this game. It had it worse.