Yehiel Horev, the strictest of all the security chiefs in Israel, especially in regard to the protection of institutions such as the Shimon Peres Negev Nuclear Research Center and the Israel Institute for Biological Research, is apprehensive that if Vanunu goes abroad, he will continue to be a nuisance by stimulating the public debate over Israel's nuclear policy and the nuclear weapons he says Israel possesses. This is the secret that it is claimed has not yet been told in the affair: the story of the security fiasco that made it possible for Vanunu to do what he did, and the story of subsequent attempts to cover-up, whitewash and protect senior figures in the defense establishment, who were bent on divesting themselves of responsibility for the failure.