The bunker at Blauwe Keet, near the N9 motorway in the vicinity of Julianadorp, is a Regelbau 134 ammunition bunker. This bunker was part of WN 138M Marine Peil Nebenstelle Den Helder.
The Regelbau 134 was designed as an ammunition storage facility for the German army (Heer). The bunker consists of two separate storage rooms, each closed off with a heavy steel door. The walls are thick and made of reinforced concrete, designed to withstand explosions from outside and keep the stored ammunition safe.
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