PURPOSE: A tunnel for thrusters of a vessel is provided to generate enough thrust because seawater is guided downward even if the diameter of the tunnel is greater than the minimum sinking depth. CONSTITUTION: A tunnel for thrusters of a vessel is formed in the transverse direction of a vessel to install thrusters on the underside of the bow or stern of the vessel. The middle portion of the tunnel is formed horizontal while both ends are declined. The upper part of both ends of the tunnel is declined at 5~15 degrees about the center line of the middle portion while the lower part(100L) is declined at 15~25 degrees.
