Cika wannan jumla: Gajiya saboda aikin canji ya ba da gudummawa ga bala'o'i da yawa na masana'antu, gami da haɗarin Three Mile Island, bala'in Space Shuttle Challenger da bala'in Chernobyl. Rahoton karshe na Hukumar Kula da Ruwan Man Fetur na Alaska a kan
Bala'in zubar da man fetur na "Exxon Valdez" ya gano cewa "yana yiwuwa" cewa yawan lokutan aiki ya ba da gudummawa ga gajiya ga ma'aikatan jirgin, wanda hakan ya ba da gudummawa ga jirgin ruwan da ke gudana.