The Moslem authorities were concerned about the ministry tunnel along the Temple Mount wall, and not without cause. Two incidents during the Mazar dig along the southern wall had sounded alarm bells. Technion engineers had already measured a slight movement in part of the southern wall during the excavations...There was no penetration of the Mount itself or danger to holy places, but midway in the tunnel's progress large cracks appeared in one of the residential buildings in the Moslem Quarter, 12 meters above the excavation. The dig was halted until steel buttresses secured the building.