Exxon Valdez oil spill
In 1989 a ship called the Exxon Valdez hit Prince William Sound's bligh reef and spilled 750,000 of crude oil. It was a major environmental disaster but with the help of bioremediation it was diminished.
Fukushima
The nuclear power plant in japan that radiated 5.2 million terabecquerels. With the use of bioremediation it helped minimize the damage to ground water where it was hit the hardest.