Mooner, do your tubes have seam tapes? This has happened to me once where I had a seam tape lifted on the bottom of a tube and the tube seam behind it was leaking slightly. The air pressure was enough to hold the seam closed normally but when under way the seam tape acted as a scoop and forced water through the leaky joint and into the tube overcoming the air pressure and filling the tube.
Depending on whether the back of your valve is sealed onto the inside of the tube, I would suggest unscrewing the valve, securing the inner part (ie tie string round it to save having to wiggle it back into place later on) and then hoovering the water out through the valve hole. Once dry, refit the valve and check all seams etc for leaks/holes/anywhere the tubes aren't attached to the tubes etc.
Sam
(RIBstore)
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