Washington, D.C. (Global Adventures): After extensive testing, BP has finally signed a letter of intent to buy 32 centrifuges from Ocean Therapy Solutions to help with the cleanup of the oil spill in the Gulf of Mexico. Actor Kevin Costner, who provided up to $26 million to fund research and development since the 1989 Exxon Valdez accident, demonstrated weeks ago how the machines work (Global Adventures reported here).