caisson
ˈkeɪs(ə)n
kəˈsuːn
noun
a large watertight chamber, open at the bottom, from which the water is kept out by air pressure and in which construction work may be carried out under water.
noun
a large watertight chamber, open at the bottom, from which the water is kept out by air pressure and in which construction work may be carried out under water.
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