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Radios just don't work in confined spaces. Cell phones? If your local carrier is like mine, it isn't reliable above ground, much less down below, or in heavy metal environments. Yelling? Please. If yelling worked, you wouldn't be reading this. Tugging on a rope or banging on a pipe are also terrible ways to pass information back and forth, especially in an emergency. The only viable answer is a hardline communication system. And nobody provides a better product than Con-Space Communication …