After 16 years in prison , and a lengthy campaign , their convictions Legal_rulings were declared Expressing_publicly unsafe and unsatisfactory , and quashed Removing by the Court of Appeal in 1991 .

An investigation Criminal_investigation conducted Action by the United States Environmental Protection Agency ( EPA ) concluded in 1996 that the explosion Attack was initiated Process_start by an accelerated thermal decomposition reaction Response as `` a direct result of unsafe operating Being_in_operation procedures and conditions '' at the plant .

A month later , unsafe conditions inspired Causation hundreds of servicemen to refuse Agree_or_refuse_to_act to load munitions , an act known as the Port Chicago Mutiny .

The U.N. had been concerned that aid was not arriving Arriving fast enough , and the World Health Organization reported Reporting that ten million people were forced to drink Ingestion unsafe water .