A 'caisson' is a watertight structure made of reinforced concrete that is used in the foundation work of piers, docks and sea installations and it derives from the French word for a large chest or box. The one pictured here is the Caisson Phoenix at Arromanches-Les-Bains. The one featured in The Orcadian is to defend the Churchill Barriers, Orkney, and is ready to be deployed when the weather permits.
Scottish Islands Explorer - foundations laid every other month
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