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I agree with Mr. Jetley on Cofferdam.
Concur with Mr. Jetley !!
A cofferdam on the Ohio River near Olmsted, Illinois, built for the purpose of constructing the Olmsted Lock and Dam
A cofferdam (also called a coffer) is a temporary enclosure built within, or in pairs across, a body of water and constructed to allow the enclosed area to be pumped out, creating a dry work environment for the major work to proceed.
Correct mr. Jetley, the are also used as permanent structures for under quays.
here is an example: http://www.whalingcity.net/picture_hurricane_barrier.html
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