Mr Unsworth, who provided mapping knowledge of the cave to rescuers, said Mr Musk's prototype would have had "absolutely no chance of working". Secondly, nearly everyone is in agreement that he went way overboard with the remark accusing Unsworth of being a pedophile just because he doesn't like what the man said, as can be seen in the replies to his tweet.
Agence France-Press reported on Monday that Vernon Unsworth is considering taking that step after Musk used the term in a tweet over the weekend. The submarine was reportedly 5 feet and 6 inches long, small enough to carry one of the boys but likely rigid and obtuse in the tight, murky dimensions of the cave network. "Just a PR stunt".
When a Twitter user pointed out that Musk was "calling the guy who found the children a pedo", the billionaire responded: "Bet ya a signed dollar it's true".
By the time he arrived numerous boys had already been rescued and British caver Vernon Unsworth, who lives in Thailand and has spent years exploring the Tham Luang cave system where the boys were trapped, said Musk's actions were a "PR stunt" and that the sub had "absolutely no chance of working".
Offended by this, Musk responded on Sunday (July 15) in a series of tweets on his Twitter account, and called Unsworth a "pedo guy".
The schoolboys and their coach, part of a football team, were trapped at the Tham Luang cave complex in Chiang Rai. They built a "kid-sized" submarine with rocket parts.
In his first tweet of the thread, Musk said he didn't meet Unsworth and that he "never saw this British expat guy who lives in Thailand".
The sentiment was shared by British cave diver Jason Mallinson, who told ABC's Four Corners programme, "I was confident of getting the kid out".
Last week, as the rescue effort was under way, Mr Musk hit out at the Thai official in charge of the mission's command centre, Narongsak Osotthanakorn, after he said the mini-sub was "not practical with our mission", though it was "technologically sophisticated".
The experienced diver also called the submarine a "PR stunt" and said Musk could "stick his submarine where it hurts".
Musk had earlier provoked condemnation after tweeting that the Thai rescue chief, who had declined the submarine prototype offer, was not really in charge of the operation.