generate questions: On 16 March 2011, the freighter MS Oliva ran aground on Nightingale Island, spilling tons of heavy fuel oil into the ocean, leaving an oil slick threatening the island's population of rockhopper penguins. Nightingale Island has no fresh water, so the penguins were transported to Tristan da Cunha for cleaning.
When did the freighter Nightingale run aground? {sep_token} What was spilled when the freighter ran aground? {sep_token} what animal was threatened with the fuel oil spill? {sep_token} where were the penguins transported for cleaning?