Aghorn Operating Inc., an oilfield company, Trent Day, an executive of Aghorn, and Kodiak Roustabout Inc., entered guilty pleas and were sentenced in relation to criminal worker safety and federal clean air and safe drinking water violations. According to court documents, Aghorn owns and operates oil wells in and near Odessa, Texas. Odessa is in the Permian basin where oil reserves are “sour,” meaning they have high hydrogen sulfide content. Hydrogen sulfide gas can be deadly at high concentrations.