Musk developed a mini-submarine designed to take the 12 children to safety.
However, in an interview with CNN, Unsworth described Musk's contraption as useless and as nothing more than a hook of attention.
He also said that they asked the multimillionaire to leave the cave.
"I just had no chance to function, I had no idea what the pbadage in the cave was like, the submarine, I think it was about 5 feet 6 inches long, rigid, so it would not have turned around obstacle, "Unsworth said.
"I would not have made the first 50 meters in the cave from the starting point of the dive, it was just a public relations trick."
Unsworth was in an international team of cave divers. They succeeded in taking the children to a safe place, using stretchers and a pulley system.
Musk did so in response to a tweet that contained excerpts from an opinion piece published in the New York Times by Zeynep Tufekci entitled, "What Elon Musk Should Learn from the Cave Rescue of Thailand."