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The Anderson shelters performed well under blast and ground shock, because they had good connectivity and ductility, which meant that they could absorb a great deal of energy through plastic deformation without falling apart (This was in marked contrast to other trench shelters which used concrete for the sides and roof, which were inherently unstable when disturbed by the effects of an explosion - if the roof slab lifted, the walls fell in under the static earth pressure; if the walls were pushed in, the roof would be unsupported at one edge and would fall). However, when the pattern of all night alerts became established, it was realised that in winter Anderson shelters were cold damp holes in the ground and often flooded in wet weather, and so their occupancy factor would be poor. This led to the development of the indoor Morrison shelter.

This book should be in every American home and place of business. It should be a part of all civilian and military defense preparations. In this nuclear age, prior preparation and knowledge are the primary elements of survival during nuclear war, biological and chemical attack, and other man-made or natural disasters. This book provides that essential knowledge.