well it's practically impossible to get the AI to correctly found cities in the sea. it would mostly be for human/multiplayer use. and the cities can only be founded on coastal tiles; not sea or ocean. so overall it's not really that big of an advantage for the human player over the AI. cities founded in these shallow waters will obviously have a hard time with production/food (unless of course it builds the aquahaven/seabed extractor), so the option to build a city in water is more of just an additional option than a major advantage. my goal for the mod is to make each race feel as unique as possible for the human player experiencing it. while the AI can not adopt some of the "features" i have implemented, i also try to keep balancing in mind and keep these "features" from becoming overly powerful or abused. currently test playing things like this. there is also, for example, a new race called the Archons that can "irrigate" or "fish" in shallow waters, producing extra food in them. but these "fishing boats" work very slowly, and only one can be built per 4 cities that you own.