Where has the BP Deepwater Horizon oil gone?
20 April 2011 Last updated at 07:29 BST
One of the biggest questions that remains a year after the Deepwater Horizon accident in the Gulf of Mexico is about the oil.
Unimaginable amounts poured into the waters of the Gulf and scientists have yet to agree on where it went and just what damage it may or will do.
Andy Gallacher reports on the environmental damage and tries to answer the question about where the oil is now.