"Well, I do remember seeing an advertisement of something called 'water scooter'. They claimed it's safe to ride, since it propels itself by ejecting stream of water backwards, but I'm not sure how that scooter does it. If it has a propeller, it must be hidden somewhere inside."
“Ejecting stream of water you say?” He seems to think for a moment “Hmmm, I guess that, with a water pump that creates high enough pressure, it could be possible to do it. But there is just the question, if this solution would work for something that is completely submerged”
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