The present invention mediates the formation of a bubble layer during ship's advancement by installing air outlets in the port port and starboard inlet of the side thrusters provided on the bow and stern of the hull, respectively, for setting the injection direction outward toward the center of the tunnel. The purpose is to reduce the resistance of the furnace hull and to reduce noise during operation of the side thruster. The present invention for achieving the above object is a tunnel portion 14 formed in the transverse direction of the hull 12, the thruster is installed in the tunnel portion 14 to discharge water flow, and the tunnel portion 14 When the air discharge portion 18 is provided outside the inlet of the air discharge portion 18, a plurality of radially installed over the entire circumference outside the inlet of the tunnel portion 14, each injection direction is It is set to face toward the center direction of the tunnel portion 14.
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