Now, I know this thread is a little old and I'm not bringing a whole lot new into it,
but, the recent letter (I'll look for a copy to post) mentions waves in water and drums... A lot. So I'm thinking, oil comes in drums, oil and water don't mix, but oil floats on water. Bots might not mix
with water, but maybe they could float? Could it have something do with a pseudyo-oil-spill? Just reading a little too deep, but thats where the imagination kicks in
edit: in the exitement

I forgot to mention the new controller - does anyone else find it a little curious that the new controller for the edubot is highly sealed/tightly built? It seems to me that more support for pneumatic/hydraulic components and other water-resistant electronic-supplements is a little fishy (bad pun, I know..) It makes sense to my conspiracy oriented mind, anyway.