In geotechnical engineering, a caisson (/ ˈkeɪsən, - sɒn /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships. [3] More @Wikipedia
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