Mezue ahịrịokwu na-esonụ: A na-eji mmanụ skimmers eme ihe n'ụzọ dị ukwuu iji nyere aka na mmezi nke Exxon Valdez
n'afọ 1989. Mmanụ skimmers dị iche na igwu ọdọ mmiri ọcha skimmers na-e mere maka a yiri ma otu nzube.