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This video shows a new hermetically-sealed flexible robot with hydrostatic skeleton driving mechanism, named HS crawler. All ground contact areas of the robot are driven into the same direction, and the robot can change its contour, adapting to the terrain. Thus, the robot can pass through narrow spaces. This video shows the driving motion of HS crawler. The video also includes the wireless driving motion and the driving experiment in narrow space. The prototype robot passed through a space of 300mm height, whereas the ordinary height of the robot is 400mm.