ONE OF MANY ROOMS IN THE CHATEAU CELLAR LED TO THE ABOVE GROUND BUNKER, ALL PART OF U-BOAT OPERATIONAL COMMAND. BOX- LIKE WALL OPENINGS PERMITTED MESSAGES TO BE QUICKLY TAKEN TO THE SIGNALS STAFF FILLING THIS ROOM. OVER 200 SIGNALS, SUPPLY, OPERATIONAL, AND INTELLIGENCE STAFF WERE HERE. OTHERS WERE IN ADJACENT CHATEAUX.