The widow of a man who died in a 2016 gas pipeline explosion in Alabama has sued Georgia-based Colonial Pipeline and an engineering inspection contractor for wrongful death and negligence.

Among the claims brought by the woman—and by another man who was seriously injured—is that a project inspector for Colonial did not show up on the day of the explosion. Instead, the plaintiffs said, the inspector told a subordinate to go ahead with the excavation, even though documentation concerning the pipeline’s whereabouts he requested had not been provided.