The present invention while suppressing the flow that occurs within munpul during the voyage of the ship with excessive munpul munpul cover as to prevent the pressure generated, and the agitation of the vessel upon mooring of the vessel to the ship door equipped with a door that can be formed pool attenuation , according to an embodiment of the present invention , the various equipment is moving in the water passage munpul so formed through the hull in the vertical direction , the door is opened or closed to pool sikimyeo one side while rotating the munpul is formed hinged to the hull bottom surface, the vessel so as to reduce the sway of the vessel by the wave in a state where the stationary the ship projected to be formed pool doors and a door that opens to the bottom downward rotation is provided . ; 展开▼