Natural formations, re: Dr Robert Schoch, geologist/geophysist. I’ve seen the video of Dr Schoch scuba diving among the ‘ruins.’
I’ve seen film of the site before as well. The edges aren’t as sharp as they appear. Combine that with similar rock formations above the waterline it looks like a unique natural process to me.
Schoch and West's preliminary conclusions are the construct is of natural origin and for any definitive study more time would be needed for evaluation. Their findings for reasoning natural origin as opposed to artificial were partly the horizontal fault lines and the vertical fissures cut into the mud rock shale strata and where the construct met the sea, i.e., you could somewhat see where the construct started forming under natural conditions.
Sounds like this is in shallow water?