Jump Blue

A link for those curious about Roberta's diving sport: http://www.youtube.com/watch?v=Gg9e331rKBk Underwater video of a Jump Blue competition. A 15x15m square of rope is set up 10m below the surface. You have to touch the disc at the corner and swim along the square. If you can't hold your breath any more you put a clip on the line to mark your position and swim to the surface. Can be done with or without fins. Apparently Roberta can hold her breath for 5:30 min!!