If the passage leading to the King's Chamber and the Queen's Chamber was sealed up thousands of years before the Christian Era, those later admitted into the Pyramid Mysteries must have received their initiations in subterranean galleries now unknown. Without such galleries there could have been no possible means of ingress or egress, since the single surface entrance was completely dosed with casing stones. If not blocked by the mass of the Sphinx or concealed in some part of that image, the secret entrance may be either in one of the adjacent temples or upon the sides of the limestone plateau.