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A USA TODAY investigation, in collaboration with affiliated Gannett newspapers and television stations across the U.S., found tens of thousands of miles of aging gas pipes lurking beneath American cities and towns despite the cast-iron and bare-steel gas pipes being the subject of safety warnings by the NTSB, safety advocates and regulators for decades. The data-and-documents driven investigation delved into the make and safety of natural gas pipes operated by every utility in the United States, shining light on some cities with some of the oldest, leakiest natural gas mains across the United States in a national story, television package and a digital interactive that let users see the age and safety record for communities where they live and work, compared to national norms.