The pillbox is quite well preserved. You can't go inside. It is located at the very end of Fort "A". In order to get to it, you must first descend from the rampart and climb from the right or left side of the fort.
The border guards started it all, there's no way to get in. There's nothing to see, we shouldn't have come, we were upset. We climbed, of course, there are two entrances, but we couldn't get through. I wanted to see in detail, unfortunately, we ran into the doors.