Five Unanswered Questions About the Gulf Spill More than 100 days after the BP oil-spill disater began, things are finally looking up. But scientists and government officials still have much to learn about the accident and its long-term impact. by Ian Yarett | Aug 3, 2010 4:00 AM EDT Exactly how much oil has leaked? Where has all the oil gone? Does the wellbore have good integrity? Are underwater seeps from old wells common? Why aren't there more dead animals?