Hi there @3speak and all,
Here is a great video that i took last week of a bunker that i found with my kids wen we went for a walk in the dunes and forest of Ijmuiden the bunker was very well hidden and in the middle of no were. These kind of bunker are all around here there must be thousends of them each have long hall ways that connect to other bunkers the most off them are borded shut or filled up with a lot off sand. I hope you enjoy this video!
Have a great day all..
▶️ 3Speak