Underwater City Options

[Born in a burial... Suit]

One of the things that was a whole ton better in mw was the fat that there were actually caves and other interesting stuff underwater. In OB the only thing that is underwater is a couple of slaughterfish. I think someone should come up with an underwater city. I am not saying like a totally new race of merpeople, though that would be awesome, i'm just saying there should be interesting ruins underwater because there is so much you can do with it. I would like help and ideas. If anyone is interested just sy so. I really want unique models for the architecture in case u wonder.