Agence France-Presse: Legendary explorer Jacques Cousteau would have been “horrified” by the devastation being wrought by a huge Gulf of Mexico oil spill, his grandson said after diving down into the seas. “There’s a chemical dispersant/oil mixture that is now… over vast areas of the Gulf and as we feared it’s not concentrated at the surface,” Philippe Cousteau Jr. told CNN, adding “this absolutely is a nightmare.” “We were about 15 to 20 feet down and it was dispersed into smaller and smaller …