After ten years at a cost of two billion US dollars, the Delta Project--a storm surge barrier in the Eastern Scheldt of the Netherlands--is nearing completion. The barrier consists of 65 prestressed concrete piers linked by steel gates weighing 286 to 528 tons each. Each concrete pier weighs nearly 20,000 tons, stands 105 to 131 feet high and measures 82 by 164 feet. Immense, specially designed equipment and lifting vessels were used to transport and place the piers in position exactly 147.6 feet apart in the fast moving tidal waters. To prevent shifting on the sandy channel bottom, each pier rests on two mattresses filled with sand and gravel.