Take a look inside one of the remaining pillbox bunkers, located in East Sussex.
This military bunker, called a pillbox, was built in the 1940s during the second world war, and was used for the defence of the country against a possible enemy invasion.
About 28,000 pillboxes and other hardened field fortifications were constructed, of which about 6,500 still survive today.
This pillbox is a Type 24 (casemate number A248), the most common type built, of which more than 1,724 still exist today.
The type 24 pillbox is an irregular hexagon shape.
Internally there is a Y-shaped anti-ricochet wall (the top of the Y nearest the entrance), which also helps support the roof.
The type 24 walls were always built to be at least a bullet-proof standard of 12 inches (30 cm) thick, but were often thicker.
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