Mezue ahịrịokwu na-esonụ: Ike ọgwụgwụ n'ihi ọrụ mgbanwe enyewo aka n'ọtụtụ ọdachi ụlọ ọrụ, gụnyere
Ihe ọghọm Three Mile Island, ọdachi ụgbọelu Space Shuttle Challenger na ọdachi Chernobyl. Akụkọ ikpeazụ Kọmitii Na-ahụ Maka Mmanụ Ala nke Alaska wepụtara banyere ọdachi mmanụ a wụfuru n'ụgbọ mmiri "Exxon Valdez" kwuru na "ọ ga-ekwe omume" na ịrụ ọrụ ọtụtụ awa mere ka ike gwụ ndị ọrụ ụgbọ mmiri ahụ, nke mekwara ka ụgbọ mmiri ahụ kpọkaa.