Located 10 feet above the lower complex was another series of rock cavities (caves 666–668). Although unhealthy conditions prevented the excavation of this upper complex, Watson and her team explored and surveyed 12 interconnected round chambers measuring between 10 x 10 feet and 15 x 15 feet (caves 667 and 668). The rock-hewn rooms were impossible to date but were well equipped with stone columns, lamp niches, sleeping benches and porch-like galleries to create relatively comfortable living conditions. It is possible that the early Christian leaders may have hidden in these concealed caves after fleeing Jerusalem.