CONFIDENTTAL Annex B IMPORTANT FACTORS IN THE DEVELOPMENT OF AN UNDERGROUND SHELTER PLAN FOR A METROPOLITAN TARGET AREA CONTENTS INTRODUCTION 83 LIMITATIONS OF UNDERGROUND SHELTER 83 ESSENTIAL CHARACTERISTICS OF AN UNDERGROUND SHELTER PLAN 84 UNDERGROUND SHELTER PLAN AS PART OF A METRO- POLITAN REGIONAL PLAN PRELIMINARY Starr Srupies — Key Puans ror DisPERSAL — ADMINI8TRATIVE CONTROLS 85 OTHER COMPONENTS OF A METROPOLITAN REGIONAL PLAN 89 TABLE Bl, ComparaTIVE CONSTRUCTION AND OPERATING Costs FoR ABOVEGrape AND UNDERGROUND INSTALLATIONS 90 ORO-R-17 (App B) 81