In total, an estimated five thousand people had sought refuge in the vast labyrinths. After the liberation, the Americans set up a field hospital in the Gemeentegrot. It also gave the men a chance to recuperate from the fighting at the frontline. Their signatures in the soft marl of the corridor system are silent witnesses to their presence.
A number of silhouettes of the last group of soldiers who visited the corridor system deserve special mention. The portrait of former President Roosevelt by G.I. Thomas Houdeis a real eye-catcher.