Reinforced concrete culverts for South Humber Bank＇s intake and outfall cooling water culverts were precast at a site in Immingham Docks. Seventy-four 600 t units 45.65 m long x 5.98 m wide x 3.60 m high were cast on a prepared bed, lifted and transported on modular trailers to barges for towing to the construction site. A specially fabricated frame, suspended from two shearleg barges, lifted the units from the transport barge and lowered them into the water. In the foreshore area where site of special scientific interest (SSSI) restrictions applied, the units were floated into a wet cofferdam before being lowered onto a prepared bed by winches supported on the cofferdam frames. From the end of the cofferdam the units were placed directly into a dredged trench where a gravel bed was prepared by backhoe excavator using new control techniques. The programme was constrained by SSSI restrictions but the project was completed within 12 months of the contract being awarded.