They had woken up early and had a quick breakfast in the hotel cafeteria. Then they got into the rented car, and guided by the GPS they went to the junkyard where Jacob Efron had shown them the door that led to the underground universe of Acre.
Jerome opened the metal door, everyone lit their torches and entered the mysterious underworld that opened before them. As the Israeli he had given them a hand-drawn map indicating the rooms and halls covered by rubble and the corridor segments known to him. They had already agreed that they would travel the network in a certain counterclockwise direction so as not to get lost and they would cross out the sectors visited on the map. As they advanced, they neatly scanned the walls for possible clues, but the geometric patterns made at the point of a chisel in times past were difficult to interpret.