The term 'sea bed' refers to the bottom of a body of water, such as an ocean or sea. It is also known as the ocean floor or seafloor. The sea bed is composed of sedimentary rocks, sand, and mud, and is home to a variety of marine life. The crossword solution for this term is 'BERTH, ' which is defined as a place where a ship can moor or anchor. Berths are typically located in harbors or ports, and provide a safe place for ships to dock.