the inner mulberry units, wartime leftovers. they were concrete harbour sections to be refloated from the sea bed at pagham and taken cross channel for normandy landings. a few were left due to to damage on initial sinking, the area is a marine reserve now and makes for fantastic diving in shallow water
Facts about inner mulberry

• It is in United Kingdom
• inner mulberry is in the English Channel.
• The typical depth is 0-10 Metres 0-30 Feet.
• The typical visibility is 3-10 Metres 10-30 Feet.