Enlarge / Elon Musk speaks onstage at SXSW on March 11, 2018 in Austin, Texas. (credit: Getty Images | Diego Donamaria ) A diver who helped rescue boys trapped in a Thailand cave may sue Elon Musk after the tech billionaire called the rescuer a "pedo guy." Diver Vernon Unsworth was instrumental in the rescue, and he said that Musk's attempt to build a small submarine for the rescue effort was a "PR stunt" that had no chance of working.