“Although they carry the vast majority of our oil and natural gas, the nation’s 2.5 million miles of pipelines remain largely invisible to the public. And while they’re much safer than alternatives such as trucks, pipelines suffer hundreds of ruptures and spills every year. Critics blame minimal oversight and old pipes for accidents that could have been prevented; operators maintain that they’re committed to continuous improvement. Here we map accidents that regulators labeled “significant incidents” from 1986 to the present.”