Tech billionaire Elon Musk has come under fire after calling one of the divers who helped rescue the Thai boys stuck in a cave a "pedo".
Twelve boys and their football coach were rescued from a cave in the northern Thai province of Chiang Rai over a number of days last week.
A team of divers guided them out in a dramatic rescue that captivated viewers from all over the world.
Mr Musk, the founder of Tesla, announced during the rescue efforts he had created a mini-submarine that would be capable of rescuing the trapped Wild Boars football team.
His offer was turned down, with British rescuer Vern Unsworth claiming the submarine would never have worked, and would've preferred him to just keep it for himself.
In an interview with CNN, Mr Unsworth said it was "nothing more than a PR stunt".
"He can stick his submarine where it hurts," he told CNN.
"It just had absolutely no chance of working. He had no conception of what the cave passage was like.
"The submarine, I believe, was about 5ft-6in-long [and] rigid, so it wouldn't have gone round corners or round any obstacles.
"It wouldn't have made the first 50 metres into the cave from the dive start point. Just a PR stunt."
Mr Musk hit back, saying the submarine was a genuine attempt to help, and that he was shaken by peoples' opinions.
He said in a number of tweets he had never met Mr Unsworth and denied he had been asked to leave the rescue site.
He ended his tirade by Tweeting: "Sorry pedo guy but you asked for it."
When he was challenged by other Twitter users over why he called one of the rescue heroes a pedo he replied: "Bet ya a signed dollar it's true."
The tweets have now been deleted.