Floating on the ocean at night while holding onto a raft that is shooting powerful beams of light into the blackness below sounds, well, insane. And it is. It's insane, and unnerving, and exhilarating, and—and then you see them. Manta rays. Bat-like and big as a barn door, ghosting through the water while feeding on the plankton that has been attracted by the lights. These giant, graceful, gentle creatures put on a show worthy of the Blue Angels as they perform fly-bys and barrel rolls in the gloom, almost but never quite touching the gawping snorkelers on the surface who are clutching their sanity and dignity as tightly as this blazing raft in the inky ocean.