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A Phoenix caisson under construction.

A Phoenix caisson under construction.
A Phoenix caisson under construction.
© National Maritime Museum, London
Repro ID: H4857
Description: One of the huge concrete caissons forming part of the Mulberry harbours. Over 200 were built, with some weighing 5,800 tonnes. Their construction caused a huge security headache for the authorities. Operation Mulberry was top secret, as the building of artificial harbours gave clues as to the likely assault site. The authorities took pains to spread the gossip that these were ‘boom defence units’, designed to protect port installations from German rocket attacks.
Creator: Unknown
Date: 1943-44
Credit line: National Maritime Museum, London
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