Opened in 1971, the Seaforth Dock site in the Port of Liverpool occupies about 500 acres, of which 85 acres is water. The dock was the largest built in the United Kingdom for some time, with 10,000 ft (3,000 m) of quay and a depth of 50 ft. A large part of the dock is dedicated to container traffic and these are four of the eight cranes used for containers.