Mr Unsworth lives in Chiang Rai. Musk, for no reason whatsoever, called Unsworth a "pedo".
If not, a summary of man and cave follows.
Another one of the divers who helped rescue the boys, Australian diver Craig Challen, told ABC.net.au that he didn't know if everyone would make it out alive.
Musk on July 6 began brainstorming at length on Twitter about a small submarine to help rescue the team. And while Musk's fans lauded his intentions, his submarine drive-by also became the butt of many jokes.
Musk, who has previously given to both Republicans and Democrats, wrote on Twitter on Saturday that he is "not a conservative" but was criticized for the contribution to Republicans.
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Mr Unsworth is said to have been instrumental in the rescue of the boys.
"He can stick his submarine where it hurts", Unsworth said in an interview.
"He had no conception of what the cave passage was like", he said.
Like other critics, Unsworth noted that the flooded tunnel was extremely narrow and twisted.
"The sub I believe was five or six feet long, rigid, so it wouldn't have gone around corners or around any obstacles". Musk said of his giving that "a nominal annual amount goes out automatically to both parties to maintain dialogue". "It wouldn't have made it the first 50 meters".
Elon Musk lashed out at Thai football team rescue diver Vern Unsworth on Twitter.
Musk's Sunday tweets came in response to a New York Times opinion piece entitled "What Elon Musk Should Learn From the Thailand Cave Rescue". "Thai navy seals escorted us in - total opposite of wanting us to leave", Musk wrote.