Last week, tech mogul Elon Musk announced on Twitter that he was dispatching engineers from his SpaceX and Boring Company teams to aid with the Thai government's mission to rescue 12 boys trapped in a cave in the country.

Musk tweeted that his engineers had been working on a mini submarine to aid rescue workers at the Tham Luang cave in northern Thailand. Musk then shipped the submarine out to Thailand, commenting that it was ready to be used if and when it was needed.

Now that all 12 boys have been safely recovered, one of the rescuers involved, Vern Unsworth, has slammed Musk's involvement as "a PR stunt."

"He can stick his submarine where it hurts" the British rescue worker told CNN. "He had no conception of what the cave passage was like," adding that the submarine "wouldn't have gone round any corners or round any obstacles. It wouldn't have made the first 50 metres of the cave."

After the boys were rescued, Musk was quick to tweet his heartfelt sentiments about the mission.

However, Unsworth also added that while Musk and his team entered the cave to assist with the operation, they were asked very quickly to leave.

You can watch the clip from CNN's interview in the player above.

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