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Miracle Harbor 4

Image of caissons in a row.
Description: 4. The caissons were placed in a continuous row. They were built in six different sizes for different depths of water. The biggest displaced 6,044 tons, the smallest 1,672 tons. Note the sea-cocks used to let in the water to sink them in position. Dredge ships also pumped sand into the compartments. For protection against enemy air attack anti-aircraft guns were mounted on the biggest caissons and barrage balloons floated overhead. Quarters for the A-A gun crews were built on the caissons.
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