BP has already spent over $1 billion on the clean-up operation .

VOA: standard.2010.06.18

The World Health Organization says the simple operation can cure up to ninety percent of fistulas.

VOA: special.2010.08.09

"But the problem on the relief well is not simply drilling all the way down, it is also connecting it up, and that is a delicate operation that could take some time."

VOA: standard.2010.07.16

Earlier Friday, BP's incoming CEO Bob Dudley, said it is time to scale down the vast operation to clean up the Gulf of Mexico oil spill, but he stressed his company's commitment to fully restore the environment.

VOA: standard.2010.07.31