The Portland Mulberry Harbour Phoenix Units are two reinforced concrete caissons, built as part of the artificial Mulberry harbours that were assembled as part of the follow-up to the Normandy landings during World War II.
[2] When planning the invasion of France the allies knew they needed to supply the troops who were ashore.
[3] The Mulberry harbours were considered a success in their supporting role of Allied troops.
[3] The two units left behind are now used as a wind break, helping ships berth at Queen's Pier.
[3] In 2017, six statues were installed on the tops of the units, representing two British Sailors, two American GIs and two Dock workers.