There is another known bunker but it was not accessible anymore. We asked the caretakers of the area to access it and they were so kind to let us pass a closed gate. It’s farmland with some cows on. In the middle there are a few hills. First I thought the hills are the bunkers but when we get there in the middle of the hills was a big hole with a shell of a bunker. Although the bunker is not in correct position anymore. It looks like someone tried to blow it up but the bunker was too solid to break.
https://goo.gl/maps/YZtbFM7448y