Atlantis or not...I’ve never seen that kind of design occurring naturally. Very interesting.
Giant tubeworms?
That is what all the _______ mystery proponents say about anything that is discovered that supports their “sighting of the unexplained” of the day.
Me, I think it is evidence sharks built giant chess boards to try to attract the very intelligent aliens who might enjoy a board game and so would stop to play.
Once on the planet and in the ocean they are food for the sharks.
Come to think of it now, sharks may be the reason we have not been taken over by aliens.