A Cutter Suction Dredger (CSD) 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 suctioned through a pipe and transported to a designated location. This equipment is commonly used for maintaining waterways, creating harbors, and deepening channels. CSDs are equipped with a powerful pump that allows them to efficiently move large volumes of material. They can operate in various water depths and are often used in projects involving land reclamation, river maintenance, and port development.