The Eighth Sea is purely theoretical, there is no substantial proof that the Eighth Sea exists outside of the minds of people. The philosophers of the Second Seven Seas have reasoned that if there are seven seas where they shouldn't be, logic follows that there may be an eighth sea where it shouldn't be. Theoretically it is possible that a sea such as the eighth may exist if it is only in the realm of the imagination. If the imagination is in fact a realm then it follows that the sea should, in fact, exist.