This content is private or does not exist.
Enter password: Go
Escalier de 21 mètres de profondeur créé lors de la défense passive en 1943 pour accéder rapidement à l'abri.
Tap here to start VR
Please rotate the device into landscape mode and insert into your VR headset. Tap here to exit VR mode
Virtual Tours and 360/panoramic photos are highly interactive formats. They require Javascript and WebGL to run properly. Please enable Javascript in your browser or use another browser that supports Javascript.