Exploring Pteron

I thought I'd check out a "Showcase" location again. Clicking through the pictures, I stopped at one...Pteron. Upon tp'ing there, this strange jade city bathed in teal rose out of the water...
Of course, I had to go under the water as well...Hidden places and things. "Conceptual" is an understatement, but it is inventive in a way. Found myself inside a sunken submarine on...something...