WHAT: a tiny boat. that is propelled solely by bubbles! works in lakes AND bathtubs!
OBJECTIVE: exactly as above. it shouldnt sink when it's air reservoir is emptied. make them cheap and easy enough to make a fleet.
HOW: probably a balloon would be in play somehow. it would be really nice if i could manually change the direction of propulsion using a little rudder.
APPLICATION: boats. that make bubbles. there is no useful application other than fun.
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