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We focused on marine safety of water surface leisure activity. Among many marine accidents, tube accident is the most common case among the swimming accidents. To solve these problems, we apply to ballast water of ship. Our tube was separated as two layers. The upper part is the layer of air to float the tube, and the lower part is a vacant layer which is composed by air wall to hold water. When user ride on the tube, water will gets into the lower layer through small vents on the bottom surface of the tube according to force between user’s weight and buoyancy. We can enjoy more safety leisure activity using this ballast tube.
Busan, South Korea