I should probably add, there is already an existing civilisation and city under the sea as that is were the majority of the Sahagin live. Though I wouldn't see them as being playable, I would be up for learning more about Sahagin culture, social structure and actually seeing what a Sahagin city looks like.

However I think its safe to say we most likely will be exploring something pre-existing in lore for the time being rather than going off left field.