When Mr Musk offered his help, posting videos online demonstrating how "a tiny, kid-size submarine" could be used to save those stranded, Mr Unsworth branded it a "PR stunt" and said the businessman could "stick his submarine where it hurts".
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 submarine, I believe, was about 5ft 6in long, rigid, so it wouldn't have gone around corners or round any obstacles". Like others, Unsworth who played an instrumental role in the Thai cave rescue operation also criticised the submarine and called it impractical for the cave's tight-winding passages.
Musk did not take Unsworth's remarks lightly.
The 12 boys and their coach were trapped for over two weeks in the cave before the Thai Navy SEALs and a group of divers rescued them. "We will make one of the mini-sub/pod going all the way to Cave 5 no problemo", he wrote.
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Getty ImagesElon Musk called a hero British cave diver who criticized him a "pedo guy".
Here are some of the responses his tasteless attack on Unsworth garnered on Twitter.
He told AFP that he would consider legal action "if it's what I think it is, yes".
A spokesman for Stanton later told The New York Times that the cave proved to be too narrow for the submarine.
Meanwhile the two Australians who helped in the global rescue of the Wild Boars soccer team were given diplomatic immunity in the event anything went wrong during the treacherous rescue.
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Musk also said he would bet a "signed dollar" on his accusations - presumably that the man is a pedophile - being true.
This prompted Mr Musk to hit back in a sting of tweets on Sunday, detailing his recent trip to the Thai cave.
Last Tuesday, Mr Musk told his Twitter followers he had just returned from the Tham Luang Nang Non cave complex. He unleashed one of his famed Twitter rants, saying, "based on extensive cave video review & discussion with several divers who know journey, SpaceX engineering is absolutely certain that mini-sub can do entire journey & demonstrate at any time".
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