On August 20, 2010, 30-year-old Ben McDaniel attempted one of the most dangerous underwater cave dives in the United States--a cave called "The Vortex" in Ponce De Leon, Florida. Underwater witnesses saw him entering the cave, though when he never resurfaced, authorities believed his body would be recovered in the cave. But the most experienced cave divers in the world went down there looking for him and found nothing. So what happened? Did Ben fake his own death? Where is he?