AP videographer Brian Skoloff and Greenpeace Oceans Campaign Director John Hocevar are lowered into the Gulf of Mexico in the Dual Deep Worker submarine from the Greenpeace ship Arctic Sunrise. A team of independent scientists joined the crew of the Arctic Sunrise to conduct a series of scientific research programs that will further the understanding of the impacts of both oil and chemical dispersant on the Gulf ecosystem in the aftermath of the British Petroleum oil spill.