In August 2010, 30-year-old diver Ben McDaniel descended into the waters of Vortex Spring, Florida and was never seen again. His disappearance ignited a swirl of theories: Was it a tragic diving accident? A staged vanishing? Or did Ben find himself caught in something much stranger beneath the surface?

Tonight, we explore the timeline, the evidence left behind, the controversial recovery efforts, and the unresolved questions that continue to trouble investigators and the diving community.