I thought about it yesterday and discussed a bit with Ironhawk. I think it is best if i take Caelum and we just start the game.
Being the only underwater nation would be unfair, playing with 2 water nations would rise the annoying question about the map since there are so few good maps that are fair for 2 water nations, the world map, faerun and orania are the only ones that come to my mind, but they are all too huge.
So if nobody disagrees i just take caelum and lets start the game asap