The transmission center
Buried telephone cables connected the position to each regimental CP and the Carpiquet aerodrome.
The bunker contained a radio transmission center and was equipped with a ventilation system, generator and water cistern. A team of secretaries, telephonists, cartographers and officers worked constantly beneath this thick limestone shell. A small garrison was in charge of defending the structure. Each of the three entrances on alternate sides was defended by a machine gun. Double-leaf armoured doors completed the defence system.