Abstract
Large crater-forming pipeline explosive ruptures in the past 25 years are briefly reviewed in this paper. The National Transportation Safety Board reports on these accidents have found the mechanical failure of damaged or defective pipe to be the rupture cause. An alternative cause explored and discussed here is the explosive ignition of accumulated gas leaks from pipeline defects into surrounding air spaces. Remedial actions augmented to address the added risks associated with pipeline leaks and nearby air spaces could improve public safety.