| 11. | Her hull was surrounded by a concrete cofferdam thick.
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| 12. | The initial main work was construction of a large cofferdam surrounding the worksite.
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| 13. | In that excavation, however, the water was not drained from the cofferdam.
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| 14. | The walls of the cofferdam are made of 60-foot interlocked steel sheets.
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| 15. | Cellular cofferdams were constructed to retain the material.
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| 16. | A cofferdam was then built around the wreck.
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| 17. | A cofferdam may also refer to an insulating space between two watertight ballast space.
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| 18. | To allow for construction without impacting the water supply, a cofferdam was constructed.
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| 19. | A watertight internal cofferdam, filled with cellulose, stretched between these two decks.
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| 20. | In Egypt he blew up the cofferdam to enable building of the Aswan Dam.
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