Mezue ahịrịokwu na-esonụ: N'afọ 1989, ụgbọ mmiri Crowley bu ụzọ bịa n'ebe ụgbọ mmiri na-ebu mmanụ "Exxon Valdez" nke mebiri emebi dị na Prince William Sound, Alaska. Ihe
"Exxon Valdez" mmanụ mmanụ bụ nke abụọ kachasị ukwuu na akụkọ ntolite US (mgbe "Deepwater Horizon", 2010) na Crowley bụ onye isi na-eweta akụrụngwa ụgbọ mmiri na ndị ọrụ maka nhicha. Iji gbalịa izere ọdachi ndị ga-eme n'ọdịnihu, Alyeska Pipeline Service Company gbara nkwekọrịta na Crowley iji nye enyemaka tankị na ọrụ escort na Valdez na Prince William Sound na-eji tugs na "teknụzụ kachasị mma".