05. Baia Mare Cyanide Spill After the Chernobyl incident in Russia, this cyanide spill in Baia Mare, Romania is aptly called the worst environmental disaster in Europe. On January 30, 2000, 100,000 cubic meters of cyanide- contaminated water leaked out from a dam, spewing out 100 tonnes of cyanide. An incredible amount of fish and aquatic plants were killed and up to 100 people were hospitalized after eating contaminated fish.