Musk, 48, the billionaire chief executive of electric carmaker Tesla Inc and founder of the rocket company SpaceX, also apologized to the plaintiff from the witness stand in the packed Los Angeles courtroom.
Musk was the first witness called to testify in the lawsuit brought against him by British cave diver who gained fame for his lead role in the rescue of 12 boys and their soccer coach from a flooded cave in Thailand last year.
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