Elon Musk is attacking a diver who helped to successfully rescue a group of teenage boys from a Thai cave last week, after the rescuer criticized Musk's mini-submarine he designed to help with the mission. Vern Unsworth, a British diver who helped with the international rescue mission, called Elon Musk's submarine rescue plan a "PR stunt." He did not hold back, saying of Musk, "He can stick his submarine where it hurts." Unsworth's comments did not sit well with Musk.