In the final bunker complex, it seems like it does not have emergency exits and firing slits bu rather it has numerous armoured observation posts. It is reminiscent of how v2 test launches were often observed from many angles to spot failures. Perhaps it was a testing area for some ordnance or "device". German observation positions were often a simple narrow vertical tunnel with a lader and a small seat which is what those "escape" laders look like. Nothing about those bunkers looks designed for combat, its more of an underground, bomb resistant, industrial site. The windows are clearly not intended for fighting. Defending from blasts not bullets. Also the position of the doors to the firing slits suggests they are just windows as they really would not have defended the door well. Either the engineer was sleeping on the job or designed that for completely different purposes than a standard defensive position. The last bunker complex looks a bit like some kind of test observation site. What area does this complex look out over? Towards the ring? Inwards towrads one test area?