We passed by her off Culebrita a few weeks ago. We were later ashore at Bahia Tortuga, Culebrita when 5 crewmembers came ashore in a massive black RIB to setup next to us a round walled tent with carpet (!) and cushions, umbrellas, 3 wooden slat loungers, coolers, and 7' floating jungle gym. They were a well-rehearsed team and had everything setup and the beach raked of footprints within 20 minutes. After they left, SYA 4 pulled up to the beach with Melnichenko, his wife, two young kids and some staff. SYA 4 is a silver aluminum sided 38' jetdrive catamaran launch/landing craft with an articulating forward landing door (https://www.superyachttimes.com/yacht-news/sailing-yacht-a-and-her-four-custom-tenders). The owners and staff were very polite.

Reading his wikipedia bio, Melnichenko is a brilliant entrepreneur and has also pumped a half-billion dollars into philanthropic causes. Whether you love or hate his $500 million high-tech ship, its construction created employment for thousands. There are actually numerous windows on the vessel that are noticeable up close but are almost invisible from a distance with their silver tint. There are also numerous "bump outs". Two massive doors were swung down on either side of the ship to form outdoor patios on what must be the "owners" deck - you could see right thru the ship.