Elon Musk may have gone one tweet too far after insulting a British diver involved in the Thailand cave rescue Musk has been feuding with British rescuer Vernon Unsworth, who co-led the mission to save 12 schoolboys from Tham Luang cave on July 10 In the early planning stages of the rescue, the Tesla CEO began working on a submarine made of rocket parts designed to aid the mission In a TV interview, Unsworth criticized Musk and SpaceX engineers for sending the submarine saying it was a "PR stunt" and that the sub had "no chance" of working Vernon Unsworth, to CNN In a now-deleted tweet, Musk fired back at Unsworth, branding him a "pedo" The tweet sent investors away from Tesla stock and could expose the temperamental rocket scientist to a libel suit In his defence, Musk posted on Twitter that leaders of the Thai rescue had asked him to build the mini-sub Unsworth says he is considering legal action