This bunker is big since it has several layers for observation.
Maybe that is why Noordwijk and Batz have refitted them as a museum.
Scheveningen once had plans to do the same. The one in Zoutelande was
demolished in the 50-ties and the one west of Brest has been abandonned by
the French navy. Ther are plans to make a museum out of it.
In 2011 two were identified in Norway, one in Kristiansand (Flekkerøy) and a derivation in Stavanger.
Zoutelande, photo from the archive of the family Stroo.