Emergency exit
The metal door of the emergency exit underneath the embrasure of the observation post
The metal door of the emergency exit underneath the embrasure of the observation post (09/10/1999).

The concrete shaft of the emergency exit, broken up and moved by an explosion
The concrete shaft of the emergency exit, broken up and moved by an explosion set off by the Germans during their retreat at the beginning of 1945 (09/10/1999).

The shaft of the emergency exit as seen from the inside
The shaft of the emergency exit as seen from the inside (09/10/1999).

The trapdoor opening of the emergency exit
The trapdoor opening from which departs the the shaft of the emergency exit in the first section of the corridor inside the observation post. Notice the hinges of the closing half plates welded to the metal frame which is imbedded in the pavement (09/10/1999).

The emergency exit departs from a trapdoor opening in the pavement of the curved section of the corridor inside the observation post.
The narrow shaft parallels the casemate along its entire length, after which it make a 45°  left turn and opens to the outside a few meters beyond the embrasure.

The two half plates of the trapdoor have been removed, whereas the external door is still in place. You can see its metal latch on the outside and a locking bolt on the inside.