Unsworth called the mini-sub a "PR stunt" by the billionaire founder of Tesla and SpaceX and said it "had absolutely no chance of working", because Musk and his team of engineers "had no conception of what the cave passage was like".
Musk's posts on Twitter sparked backlash from shareholders and Silicon Valley analysts, who called his behavior immature and an impediment to the auto company's success.
The caver said he would make a decision when he flies back to the United Kingdom this week, but added that the episode with Musk "ain't finished". "The "billionaire" label, when used by media, is nearly always meant to devalue and denigrate the subject", he tweeted. "I have given vastly more to humanitarian causes".
Musk's comments were a response to an Business Insider interview with Unsworth on Sunday. The British diver reportedly helped recruit top global cave rescue experts for the mission as well.
Since then, he has been arguing with people who accuse him of shoehorning himself into the drama and imagining hypotheticals in which rescuers had not deemed his hastily built submarine unnecessary and impractical.
At a critical time for electric vehicle maker Tesla Inc.
Unsworth, 63, said he hadn't actually met Musk face to face when Musk visited the cave during the rescue effort. The unsubstantiated claim came after the expert caver criticized the miniature submarine Musk created to help with the Thai cave rescue. "The submarine, I believe, was about 5 feet 6 inches [1.7m] long, rigid, so it wouldn't have gone round corners or round any obstacles".
Mr Musk responded by saying Mr Osotthanakorn had been "described inaccurately as "rescue chief" and was "not the subject matter expert".
"I'm not going to make any further comment about him", Unsworth continued.
Unsworth said on Monday he had not reviewed the tweets in full and had only heard about them. He said Musk, whom he had never met, must have a "bruised ego".
In an open letter on Tuesday, Gene Munster, a managing partner at Loup Ventures, said Musk's comment "crossed the line".
Mark Spiegel, an outspoken hedge fund manager who has been betting on Tesla's stock falling for years, said the tweets are showing Musk's fans his true personality.
Last month, he alleged sabotage at Tesla's operations by an employee, who responded by claiming to be a whistleblower.
The main dish of tea was the wedding cake (or rather, the rest of his part), Kate and William, which they keep with 2011. It's a tradition: the pieces of cake were served and at the christening of Prince George and Princess Charlotte .
This comes on top of a 25% tariff on $34 billion worth of imports from China that came into effect last week. They warned tariffs on imports raise consumer prices and expose US farmers and manufacturers to retaliation.
Cook County Commissioner Jesus "Chuy" Garcia criticized the district for not acting more swiftly to discipline the officer. In the video, Trybus can be heard saying, "You should not be wearing that in the United States of America.
They're going to interfere in our elections. "We're not looking for concrete deliverables here", Bolton said. In his tweet, Trump said that the hacking of the servers took place during the Obama Administration.
Trump told the Sun . "So I would imagine that's what they will do, but maybe they will take a little bit of a different route. The Labour member said: "A dash of Islamophobia lobbed at Sadiq Khan who he blames for terrorism".
Putin 'proud' of Russia's handling of World Cup
Once the players reached the main square, people were clearly thrilled to catch sight of these new-found national heroes. According to Grubisic's data, there were 25% more mentions of the Croatian president than the Croatian captain.
Pacquiao stops Matthysse to win back world title
Manny Pacquiao might not have turned back Father Time, but the future hall of famer certainly looked good on Saturday night. Duterte, in a statement, congratulated Pacquiao for uniting and giving the Filipino people pride in the boxing arena.
Cheers for Meghan and Kate as they arrive at Wimbledon
The pair had an overnight stay aboard the Royal Train before attending Royal Ascot, which was her Royal Ascot debut. Ahead of Saturday's Wimbledon final, Williams had opened up about her "wonderful friendship" with Markle.
British diver returns home after football team rescue
He thanked everyone who worked to rescue the team. "I am in good health now", said one of the boys, a 14-year-old nicknamed Note. He and and health permanent secretary Jedsada Chokdumrongsuk went to Chiangrai Prachanukroh Hospital to visit the 13 people.
Why Croatian president 'can't wait' for World Cup final
England's hopes of winning a first World Cup since 1966 may be over but Southgate is pleased with the progress that has been made. On Wednesday, Croatia defeated England 2-1 in a semi-final match and for the first time reached the World Cup final.