Bloomberg reports an attempt to create floating city-states that effectively would be independent nations. The source for the story is Patri Friedman, grandson of Nobel winning economist Milton Friedman and chairman of The Seasteading Institute. Hat tip to Drudge Report for the link.
The idea is related to the concept of having one's permanent residence on a cruise ship, as COTTonLINE reported two and a half months ago. The difference being the floating city-state would be anchored in one location, presumably in sheltered littoral waters.
Achieving substantial sovereignty within another nation's territorial waters seem to be a key difficulty. It would be difficult to negotiate, even harder to defend.
Waterworld, anyone?