Let me guess – a robotic jellyfish powered by its own windfarm?
Not far off. The Water-Scraper (or h2o+scraper) is just as it sounds: a sky-scraper turned upside-down and plonked into the great wide ocean.
That idea doesn't float...
Hehe, LOL, LMAO, etc. Might I remind you that these days some cruiseliners are like floating cities. Why scoff at the idea of a watery tower block? And some of the technology needed to make it sustainable is hardly the stuff of sci-fi. Ballast and balancing tanks keep it upright, while tentacles help to steady while also generating power from the tide. On the surface, a windfarm contributes further power and vegetation provides food.
Okay, I've got my life jacket on. Where's this Atlantis thingy?
Hold your seahorses, skipper. Go and watch the Poseidon Adventure or something. You won't be able to jump aboard one of these for a very long time, as it's only a concept, entered into eVolo Magazine's Skyscraper Competition by a very clever Malaysian designer. That's not to say it'll never happen, but by then global warming may have forced us all to grow gills and flippers anyway.