"Hitherto, crowded countries...like the United Kingdom and Western Europe, have had this outstanding vulnerability to carry. But the hydrogen bomb, with its vast range of destruction and the even wider area of contamination, would be effective also against nations whose population hitherto has been so widely dispersed over large land areas as to make them feel that they were not in any danger at all. They, too, become highly vulnerable ... Here again we see the value of deterrents, immune against surprise and well understood by all persons on both sides—I repeat "on both sides"—who have the power to control events. That is why I have hoped for a long time for a top level conference where these matters could be put plainly and bluntly from one friendly visitor to the conference to another. Then it may well be that we shall by a process of sublime irony have reached a stage in this story where safety will be the sturdy child of terror, and survival the twin brother of annihilation."