The left entrance goes to the garrison and guns. The right protects the ammunition tunnels. They’re connected inside.
Look into the ammunition entrance which has another entrance defence inside the tunnel.
Lots of air ducts go into the mountain!
Protected by an entrance defence in the bend. Note the rails for ammunition transport.
Thick electricity cables lead from the engine room towards the turret.
Look from the stairhouse to the entrance. Note the door with a small cable door.