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RE: Bridges...An Old & Modern Marvel
Cool picture. Is that something they just dropped into the water? Or was it built there and drained?
Cool picture. Is that something they just dropped into the water? Or was it built there and drained?
Great question, when the water body is large and the water is very deep the cofferdam technique is used - a wall enclosing an area inside a water body is first built, inside which water is constantly pumped out and dry working conditions have to be maintained.