It describes in detail the huge amount of work involved in carefully examining the many layers of tar and earth.

VOA: special.2010.04.07

"Safety and security of our volunteers is absolutely our top priority and we are continually looking at this topic and I have to say that in the last few years we have done an amazing amount of work to try to improve both our systems to support volunteers, to ensure confidentiality and to strengthen their preparedness and training."

VOA: special.2011.03.28

"We have got an enormous amount of work to do, and people down in the Gulf, particularly businesses, are still suffering as a consequence of this disaster."

VOA: standard.2010.07.16