Deconstruction of two derelict sunken dry docks in 25-ft of water. Dry docks were too sunken to be easily raised. Docks were deconstructed in-water enclosed in a full-depth, anchored turbidity curtain. Special precautions taken to avoid cross-contamination. Debris was loaded onto barges and sent to an upland disposal site. Called for confined space diving and suction dredging.