Elon Musk has revived his strange claim that one of the heroes of the Thai cave rescue is a "pedo".

Mr Musk made the unfounded accusation after Vern Unsworth, one of the divers involved in the rescue, mocked the Tesla founder's attempt to help out with the recovery effort. But he apologised soon after, in a public comment posted to his Twitter account.

Now he has re-stated that accusation, saying that Mr Unsworth would have sued him if it were not true. While he did not state the wording explicitly, he refused to deny that he still believed the accusations about the diver.

Thailand schoolboys rescue - in pictures Show all 21 1 /21 Thailand schoolboys rescue - in pictures Thailand schoolboys rescue - in pictures Police and military personnel use umbrellas to cover a stretcher near a helicopter and an ambulance at a military airport in Chiang Rai as rescue operations continue for those still trapped inside the cave in Khun Nam Nang Non Forest Park in the Mae Sai district. Four boys among the group of 13 trapped in a flooded Thai cave for more than a fortnight were rescued on July 8 after surviving a treacherous escape, raising hopes elite divers would also save the others soon. AFP/Getty Thailand schoolboys rescue - in pictures Thai rescue team members walk inside the cave Rex Features Thailand schoolboys rescue - in pictures An ambulance exits from the Tham Luang cave area AFP/Getty Images Thailand schoolboys rescue - in pictures A military helicopter carrying rescued schoolboys approaches to land at a military airport in Chiang Rai REUTERS Thailand schoolboys rescue - in pictures Rescuers hands locked with a caption reading "We Thai and the international teams join forces to bring the young Wild Boars home" where 12 boys and their soccer coach have been trapped since June 23 in a cave in Mae Sai, Chiang Rai province, northern Thailand. The operation has begun to rescue 12 boys and their soccer coach who will need to dive out of the flooded Thai cave where they have been trapped for more than two weeks, with officials saying Sunday morning that "today is D-Day. AP Thailand schoolboys rescue - in pictures A Thai policeman stands guard at an entrance of the cave as rescue operations continue for 12 boys and their coach trapped at Tham Luang cave at Khun Nam Nang Non Forest Park in the Mae Sai district of Chiang Rai province on early July 8, 2018. Thai authorities told media on July 8 to leave a camp site near the cave where 12 boys and their coach have been trapped for more than two weeks so that "victims" could be helped, possibly signalling a long-awaited rescue effort to get them out. AFP/Getty Images Thailand schoolboys rescue - in pictures Rescuers are seen drillining ahead of the operation at the Tham Luang cave complex, where 12 boys and their soccer coach are trapped, in the northern province of Chiang Rai, Thailand REUTERS Thailand schoolboys rescue - in pictures Rescuers are seen drillining ahead of the operation at the Tham Luang cave complex, where 12 boys and their soccer coach are trapped, in the northern province of Chiang Rai, Thailand REUTERS Thailand schoolboys rescue - in pictures Ruamkatanyu Foundation rescuers are seen drillining ahead of the operation at the Tham Luang cave complex, where 12 boys and their soccer coach are trapped, in the northern province of Chiang Rai, Thailand REUTERS Thailand schoolboys rescue - in pictures Thai policemen stand guard near a cave where 12 boys and their soccer coach have been trapped since June 23, in Mae Sai, Chiang Rai province, in northern Thailand Sunday, July 8, 2018. Thai authorities are racing to pump out water from the flooded cave before more rains are forecast to hit the northern region. AP Thailand schoolboys rescue - in pictures Journalists clear and prepare to leave the cave area during the 'D-Day' for the ongoing rescue operation for the child soccer team and their assistant coach to exit the cave at Tham Luang cave in Khun Nam Nang Non Forest Park, Chiang Rai province, Thailand, 08 July 2018. The officials' operations are underway to safely bring out the 13 members of the youth soccer team including their assistant coach who have been trapped in Tham Luang cave since 23 June 2018, out of the cave according to former Chiang Rai Governor Narongsak Osottanakorn said. EPA Thailand schoolboys rescue - in pictures Thai family members of missing football players and their coach (R) pass to meet with the officers during rescue operations to save a soccer team at Tham Luang cave in Khun Nam Nang Non Forest Park, Chiang Rai province, Thailand, 03 July 2018. According to Chiang Rai provincial Governor Narongsak Osatanakorn rescuers are taking supplies and food into the cave to sustain the team while there extraction is worked out. EPA Thailand schoolboys rescue - in pictures Rescuer walk out from cave where 12 boys and their soccer coach have been trapped since June 23, in Mae Sai, Chiang Rai province, in northern Thailand Sunday, July 8, 2018. Thai authorities are racing to pump out water from the flooded cave before more rains are forecast to hit the northern region. AP Thailand schoolboys rescue - in pictures Policeman line up on the main road leading to Tham Luang Nang Non cave on July 8, 2018 in Chiang Rai, Thailand. Divers began an effort to pull the 12 boys and their soccer coach on Sunday morning after they were found alive in the cave at northern Thailand. Videos released by the Thai Navy SEAL shows the boys, aged 11 to 16, and their 25-year-old coach are in good health in Tham Luang Nang Non cave and the challenge now will be to extract the party safely. Getty Images Thailand schoolboys rescue - in pictures Rescue workers along the main road leading to Tham Luang Nang Non cave as the first 2 ambulances carrying 2 boys pass by on July 8, 2018 in Chiang Rai, Thailand. Divers began an effort to pull the 12 boys and their soccer coach on Sunday morning after they were found alive in the cave at northern Thailand. Videos released by the Thai Navy SEAL shows the boys, aged 11 to 16, and their 25-year-old coach are in good health in Tham Luang Nang Non cave and the challenge now will be to extract the party safely. Getty Images Thailand schoolboys rescue - in pictures Thai medics and police officers evacuate the first two children with a helicopter after rescued from Tham Luang cave before heading to hospital, at a helicopter pad in Chiang Rai province, Thailand, 08 July 2018. Members of a children soccer team and their assistant coach who have been trapped in Tham Luang cave EPA Thailand schoolboys rescue - in pictures An ambulance transporting the children who have been rescued, arrives at hospital in Chiang Rai province, Thailand, 08 July 2018. The first six children have been confirmed to rescue on 08 July 2018 after have been trapped in Tham Luang cave since 23 June 2018. Four members of a children soccer team and their assistant coach who have been trapped in Tham Luang cave since 23 June 2018 have been rescued on 08 July 2018, according to former Chiang Rai Governor Narongsak Osottanakorn said. EPA Thailand schoolboys rescue - in pictures Ambulances transport boys rescued from Tham Luang Nang Non cave to hospital on July 8, 2018 in Chiang Rai, Thailand. Divers began an effort to pull the 12 boys and their soccer coach on Sunday morning after they were found alive in the cave at northern Thailand. Videos released by the Thai Navy SEAL shows the boys, aged 11 to 16, and their 25-year-old coach are in good health in Tham Luang Nang Non cave and the challenge now will be to extract the party safely. Getty Thailand schoolboys rescue - in pictures Medical staff await for the rescued Thai children at Chiang Rai Prachanukroh Hospital in Chiang Rai. The twelve missing Thai children and their adult coach went missing after entering a cave at Tham Luang, in Chian Rai Privince Thailand schoolboys rescue - in pictures Ambulances transporting children after being rescue from Tham Luang cave, arrive Chiangrai Prachanukroh Hospital in Chiang Rai province, Thailand, 08 July 2018. Six children of a child soccer team have been rescued on 08 July 2018 after 12 of them and their assistant coach have been trapped in Tham Luang cave since 23 June 2018. EPA Thailand schoolboys rescue - in pictures Ambulances transporting children after being rescue from Tham Luang cave, arrive Chiangrai Prachanukroh Hospital in Chiang Rai province, Thailand, 08 July 2018. Six children of a child soccer team have been rescued on 08 July 2018 after 12 of them and their assistant coach have been trapped in Tham Luang cave since 23 June 2018. EPA

The conversation initially began when Mr Musk attempted to deny that he had actually cried in a New York Times interview. He posted that the conversation – in which he admitted he had not seen his children because of his overwork at Tesla – had not actually made him tearful.

One Twitter user suggested that Mr Musk's devotion to the facts would have been more helpful when he was making the accusations against Mr Unsworth and others involved in the rescue effort for the Thai boys.

But instead of backing down on his accusations, he went on to suggest that the story is true because Mr Unsworth has not sued him. The diver is thought to have avoided legal action in the hope that the furore over the tweets would die down.

"You don’t think it’s strange he hasn’t sued me?" Mr Musk wrote in the first of a series of tweets. "He was offered free legal services."

He went on to suggest that people who were asking for proof of the allegations against Mr Unsworth had just not investigated the truth enough.

The bizarre tweets are in direct conflict with the apology posts that Mr Musk made in the wake of the tweets.

"My words were spoken in anger after Mr Unsworth said several untruths & suggested I engage in a sexual act with the mini-sub, which had been built as an act of kindness & according to specifications from the dive team leader," he wrote then.

"Nonetheless, his actions against me do not justify my actions against him, and for that I apologise to Mr Unsworth and to the companies I represent as leader. The fault is mine and mine alone.

"I am truly sorry if I offended anyone."