THE ROYAL NAVY DURING THE SECOND WORLD WAR - Sea forts in the Thames Estuary: Putting in the floors of each section of the towers. A pre-cast reinforced "biscuit" (they were actually turned out like biscuits, one on top of another, with brown paper separating each) is attached to a steel spider and lifted into position, Then the spider is unscrewed and attached to the next floor. These secret forts of the Thames Estuary were an effective defence against attacks by sea and air on the estuary

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