Observation post The embrasure of the observation post, in the middle of the photo, seen with the telephoto lens from the top of Center 19. Immediately below it you can just see the concrete emergency exit (24/06/1999).

The inside of the observation post, equipped with an armor plate with a spy hole. Notice the steel I-beams for reinforcement (09/10/1999).

Detail of the rotating cover of the spy hole which was designed for the small model 917 telescope, the model 912 quadrant, and the 8 x 30 prismatic binoculars (09/10/1999).

The observation post, located at the bottom of the curved steps which make up the extensions of the main corridor, consists of the following parts:

• an observation post equipped with an armored plate with a spy hole with metal I-beams for reinforcing the side walls and the ceiling;
• a living quarters and telephone switchboard, provided with two entrances (one at the bottom of the steps and one at the front of the observation post);
• a short internal corridor, curved at the beginning, with an opening toward the observation post casemate and the living quarters.

In the pavement of the curved part of the corridor you find the trapdoor opening of the emergency exit. The straight part butts suddenly against a rock wall where another secondary exist was planned but never completed.

The corridor of the observatory ends at a rock wall where probably a secondary exit was planned. On the right in the foreground you see the entrance of the observation post and, on the left, a second entrance of the living quarters (09/10/1999).