Some preppers are satisfied with easing the inconvenience of a few days without power. Others are ready for years of travail. This book assumes no cell service, no phones, no internet, and no power. That drastic scenario is realistic enough for all levels of preparation. Wherever you fall on the apocalyptic spectrum, communication is critical. Imagine being hunkered in your bunker and wondering, "Does New York City still exist?" Sobering thought...