DESCRIPTION: Angular rock debris from excavation for Ted Williams Tunnel in Boston Harbor lying on natural rounded gravel of sea bed. Rock debris disposed during period from June 1992 to October 1993. White sponges. Growth on rocks possibly includes hydrozoans, bryozoans, worm tubes, and amphipod tubes. Each metal arm is 10 cm. long. DEPTH(m): 54 QUAD: 7 STATION: 1097 IMAGE NAME: 28540041.jpg