A shaft leading into underground system of fort Moulainville is abou 30 m deep.

Photo by 
M. Egger.

A partly concreted tunnel in underground of fort Moulainville. You can see old timbering yet.

Photo by
M. Egger.

A not concreted tunnel leading to an emergency exit of fort Moulainville.

Photo by
M. Egger.

A plan of the fort Moulainville with underground system.

A pillbox for defence of the tunnel leading to an underground storage
("Petit Dépot").

Photo by
M. Egger.