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Marshy rescue usually use water cannon to sweep mud away. It may do hurt to victims,also,in some situations can’t water cannon be used ,such as in forest or wildness.We redesign the spade which is special for marshy rescue.We add a pump to its shaft.When the spade is in mud ,we can pump up air into mud to make mud full of bubble which can reduce mud’s pressure and stickiness.It’s will be easier for rescuer to help victims
School of Mechanical Engineering