A cutter suction dredger is a type of marine construction vessel used for dredging underwater materials. It features a rotating cutter head that breaks up soil and sediment, which is then sucked up by a powerful pump. This process allows for the efficient removal of materials from riverbeds, harbors, and other water bodies. These dredgers are commonly used in port construction, land reclamation, and channel deepening projects. They can operate in various water depths and are equipped with a long pipe system to transport the dredged material to a designated location, making them versatile tools in marine engineering.