The present invention in cross-section a circular main pipe without the partition, then pumping the gas to the high pressure air by the air compressor during the flying, water (sea water, fresh water) during the settlement motorized, and then pumped water using an engine pump , to provide a sink-float-type cage to make these flying-subsidence work in a short period of time. An inside, there is only one room, respectively buoyancy body 1,1 'consisting of a radius of curvature different plurality of annular main pipe of large and small, in these buoyancy, air intake and outlet 2, the Mizutori inlet and outlet 3, one or a plurality of provided in the buoyant body has a suitable thickness, the overall shape is installed a plurality of buoyancy devices 4 formed of an L-shaped stanchion hollow , the horizontal portion of the buoyancy device is provided with a retaining portion for retaining the buoyancy and the vertical section of the buoyancy device is equipped with a handrail pipe 5, further, the buoyancy device, compressed air The inlet is provided, and the bottom of the buoyancy device is provided with a water ingress-leaching opening. .BACKGROUND
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