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I'm all for it, as long as it doesn't affect the core gameplay and doesn't make any race unbeatable (since I don't know anything about the creatures in this world).
P.S. I'm always in favor of something new and fresh in the game; I think it makes the game more interesting, diverse, and global.
Added after 55 seconds
or am I misunderstanding you?
Added after 15 hours 30 minutes
Most likely, we'll have to abandon the idea of reaching a certain level to enter (or exit) the water (from under the water). But, probably, a new building will be introduced, in which a sphere with water and air will be sold, giving the ability to travel underwater.