Diving Chess?

Apparently the 19th Mind Sports Olympiad sees the addition of a new chess variant, Diving Chess. It is played in a pool, with a floating board, and you are required to stay under water for the duration of your move (by which I assume you think while under water, and surface to play your move). Much like Chess Boxing, it combines both mental and physical aspects, and like Chess Boxing, may result in brain damage.
The press release covering both Diving Chess and the rest of the Mind Sports Olympiad can be found at this link.