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Crane barges at dusk. View of crane barges silhouetted against the sky. Due to the limited number of berths at the container port and the large number of ships waiting to unload, smaller ships are often unloaded by floating cranes called crane barges. These barges are also used for transporting containers after they have cleared customs. Photographed in Hong Kong, China. (KEYSTONE/SCIENCE PHOTO LIBRARY/TIM LESTER/SCIENCE PHOTO LIBRARY)