This kind of thing is always of interest to me, but I'm always prepared to be disappointed.
Radar images from above, okay, needs a follow-up.
The follow-up, side-scan, also now requires a follow-up.
BTW, given the necessary age of such a submerged structure, there's no reason to expect any similarities with Mayan architecture, due to the thousands of years gap.
Sidebar: in CW Ceram, there was an anecdote about a Central American pyramid that was on one corner buried by a volcanic eruption, and since at the time (and until recently) Mayan script couldn't be read, geologists were asked to date the lava flow, without having anything else explained to them. 20,000 years. Whoops.