I don't know just how feasible this is to implement, or even if it should be implemented, but I think cities should be able to submerge themselves to the bottom of the ocean, much like Atlantis did. This could/should just apply if they are over ocean tiles. Potential characteristics of this ability: -Submerge: Costs maybe 3x normal movement cost? And/or maybe an energy cost? -Inability to work tiles: citizens are not able to work surrounding tiles, obviously because the city is submerged and most of the improvements are on land/floating/etc. Not sure if we want to implement the ability to work tiles that has improvements that are predominantly below the surface. -Movement: unlike Atlantis, I would suggest that cities can actually move, but maybe at a rate 3x slower than their normal move, perhaps. -Surface: they can surface, but only if there is not a city directly above. If there's an unit, it's treated as if the city just moved onto it, except I guess the unit will be displaced to a random tile. As for the cost, probably 3x the normal movement cost? And/or maybe an energy cost? -Unit interactions: Maybe only interactions with submarines allowed? :3 That includes sending out submarines, and shooting at incoming submarines (and submarines can attack submerged cities). I guess though, that if submarines take the city's health to 0, that means shield failure or whatever, and the city gets auto-razed? Yes, I am totally basing this off Atlantis. XD I mean seriously, the cities in BERT are pretty much exactly like Atlantis, bar the ability to blast off into space. And the ability to submerge. Just a whacky idea of mine.