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This series reveals a threat that seeps into every nook and cranny of the United States. The country's network of natural-gas distribution lines, which is distinct from interstate transmission lines, covers almost 1.3 million miles of pipeline, some of it dating to the 1800s, Accidents involving those lines have killed more than 120 people, injured more than 500 others and caused more than $775 million in damage since 2004, a Tribune-Review analysis of federal records shows. Yet the location, age and safety of more than a million miles of those pipelines remain shrouded in secrecy. Not even government regulators and emergency responders have pipeline maps.