The present invention relates to a shipwreck reef unit which sinks a wrecked ship having ballast concrete poured into the inner floor space to the seabed to be utilized as an artificial reef unit. More specifically, flange holes are formed on the left and right lower parts in the longitudinal direction of the ship at predetermined intervals. The individual holes are connected to sinking flanges. The left and right sinking flanges are connected by path pipes arranged in the widthwise direction of the ship body while being embedded in the ballast concrete. Stand pipes connected to the upper part of the path pipes are exposed to the outside of the ballast concrete. An opening or closing valve or a flange cover is assembled on the corresponding part by exposing the front inlet of the sinking flanges to the outside of the ship. Accordingly, a path structure, which is suitable for training and underwater experiences of a diver or hiding and hunting activities of marine organisms, is provided in the ballast concrete conventionally only providing the weight needed for sinking the wrecked ships. The wrecked ships can quickly and safely be sunk to the seabed through a simple operation of flowing the seawater into the corresponding path structure by opening the sinking flanges when building the shipwreck reef unit. The entire weight of the wrecked ship including the ballast concrete can be reduced to reduce the time and fuel amount needed for towing the wrecked ship. The seawater can sufficiently sink the wrecked ship by entering the same through the path structure.본 발명은 선체의 내측 바닥공간에 밸러스트 콘크리트를 타설한 폐선박을 해저면으로 침설하여 인공어초로 활용토록 한 침선어초에 관한 것으로서, 더욱 상세하게는 좌,우 선측 하부에 선체의 길이 방향을 따라 일정 간격으로 플랜지구멍을 형성시키는 한편, 각각의 플랜지구멍마다 침수플랜지를 연결시키고, 좌,우측 침수플랜지가 선체의 폭 방향으로 배치되는 통로파이프에 의하여 연결되도록 하며, 상기 통로파이프를 밸러스트 콘크리트 내부로 매입시키되, 통로파이프의 상측에 연결된 스탠드파이프는 밸러스트 콘크리트 외부로 노출되게 하고, 침수플랜지의 선단 입구측 역시 선체 외부로 노출시켜 해당 부위에 플랜지커버 또는 개폐밸브를 조립시킴으로서, 폐선박의 침설에 필요한 하중만을 제공하였던 기존의 밸러스트 콘크리트 내부에 수생생물의 은신과 먹이활동 및 다이버의 수중체험이나
