Hubbard claimed that his "tech development"—i.e. his OT materials—had neutralized this threat, creating a safe path to redemption. The Church of Scientology forbade individuals from reading the OT III Xenu cosmogony without first having taken prerequisite courses. Scientologists warn that reading the Xenu story without proper authorization could cause pneumonia. In "RJ67", Hubbard then alludes to the devastating effect of Xenu's genocide: OT III also deals with "Incident I", set four quadrillion years ago. In "Incident I", the unsuspecting thetan was subjected to a loud snapping noise followed by a flood of luminescence, then saw a chariot followed by a trumpeting cherub. After a loud set of snaps, the thetan was overwhelmed by darkness. It is described that these traumatic memories alone separate thetans from their static (natural, godlike) state. Hubbard uses the existence of body thetans to explain many of the physical and mental ailments of humanity which, he says, prevent people from achieving their highest spiritual levels. OT III tells the Scientologist to locate body thetans and release them from the effects of Incidents I and II. This is accomplished in solo auditing, where the Scientologist holds both cans of an E-meter in one hand and asks questions as an auditor. The Scientologist is directed to find a cluster of body thetans, address it telepathically as a cluster, and take first the cluster, then each individual member, through Incident II, then Incident I if needed. Hubbard warns that this is a painstaking procedure, and that OT levels IV to VII are necessary to continue dealing with one's body thetans. The Church of Scientology has objected to the Xenu story being used to paint Scientology as science fiction fantasy (see Space opera in Scientology). Hubbard's statements concerning the R6 implant have been a source of contention. Critics and some Christians state that Hubbard's statements regarding R6 prove that Scientology doctrine is incompatible with Christianity, despite the Church's statements to the contrary. In "Assists", Hubbard says: Hubbard wrote OT III in late 1966 and early 1967 in North Africa while on his way to Las Palmas to join the "Enchanter", the first vessel of his private Scientology fleet (the "Sea Org"). (OT III says "In December 1967 I knew someone had to take the plunge", but the material was publicized well before this.) He emphasized later that OT III was his own personal discovery.