their small plane going down off turks and caicos. here's abc's stephanie ramos now. >> reporter: tonight, a rescue mission on the high seas in the caribbean. the u.s. coast guard alerted to a downed aircraft, then asking for help from a nearby cruise ship, the regal princess, sailing near turks and caicos. the ship's crew notifying passengers. >> we're now two and a half miles away. we're getting our teams ready for the rescue. >> reporter: diverting course, the ship launches a rescue vessel, racing across the choppy seas to save two american men floating in a life raft, just a speck on the ocean. they're picked up, raced back to the cruise ship, where they were cheered by passengers onboard. the men waving back, grateful to be alive. ship that's headed to st. thomas. no word just yet on what caused that plane to crash. david? >> stephanie, thank you. >>> when we come back, the new headline tonight about vaccines and autism. >>> also, the world's newest and youngest billionaire, you'll know her name. >>> and there's news coming in to