The Royal Navy during the Second World War Maunsell Sea forts in the Thames Estuary: In the dock basin the twin towers of a sea fort to be used in the Thames Estuary are rapidly rising from the floating pontoon. A pre-assembled spot welded cage is hoisted into position, and the concrete is poured between a permanent wooden inner wall and an outer steel shell. Then the steel shell is moved up and the next cast is made. These secret forts were an effective defence against attacks by sea and air on the estuary.

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Size: 1934px × 2583px
Photo credit: © piemags/archive/military / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 2, war, world, ww2