But done by humans, contrary to what Schott said.
Schott said that IF any of the features were done by humans, it was done to an already existing natural structure before it went below the waves.
He also said, "If you find anything other than what I've already been shown, I'll be on the first plane back." (...or something close to that)
I wasn't impressed with anything I saw until I saw the large carved human faces on those huge structures. Those got my attention. (I immediately thought of Mt Rushmore)