Dee ihe na-aga n'ihu na paragraf a - N'afọ 1989, ụgbọ mmiri Crowley bu ụzọ rute n'ebe ụgbọ mmiri na-ebu mmanụ "Exxon Valdez" nke mebiri emebi dị na Prince William Sound, Alaska. Mmanụ a wụfuru n'ọdụ ụgbọ mmiri "Exxon Valdez"
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".