Has BP really cleaned up the Gulf oil spill?

``The view from her submarine is different, and her attachment is almost personal. On her descent to a location 10 miles from BP's well in December, Joye landed on an ocean floor coated with dark brown muck about 4cm deep. Thick ropes of slime draped across coral like cobwebs in a haunted house. The few creatures that remained alive, such as the crabs, were too listless to flee... Her conclusion? "I think it is not beyond the imagination that 50% of the oil is still floating around out there."