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.
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".
RMC: Real Madrid and Chelsea reach deal for Thibaut Courtois
Reports now suggest that Chelsea and Real Madrid are in active talks to complete the deal. Perhaps it's a good time for [Chelsea] and for Eden [to split].
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.
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.
Theresa May is pleasing no one with her Brexit balancing act
Critics say the move is a bid by a government to escape the prospect of more rebellions in the Conservative Party. The government has so far provided no reason for the motion, which Labour is reportedly set to vote against.
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".
Xiaomi will launch two Android One smartphones next week
It will be powered by a Qualcomm Snapdragon 660 chipset paired with 4GB of RAM and three storage variants of 32GB, 64GB and 128GB. But what sets Mi A2 apart from other smartphones is that it features the stock Android experience: The Android One .