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Probably the seawater, and the sand that comes with it would eat the pumps. I could imagine them filling heklicopter buckets, and the bottom of planes with seawater. They would need a thorough cleansing though. Salt water is a tough enviroment.
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20mph is not fast, unless you are doing it in a 3/2, 1000sq. ft. house on 10 ft. waves! 
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