Watch: Elon Musk explains how SpaceX's Mechazilla can catch Super Heavy booster

SpaceX successfully flew a 233-foot rocket booster back to its launch site and caught it mid-air using Mechazilla's mechanical arms. The Super Heavy Booster, weighing about 250 tons, was captured after a test flight. "When the engines land... it's gonna drop the velocity to basically zero and come in between the arms. The arms will be wide, and as it's coming in, the arms will, will close, go flush against the side of the vehicle, and the vehicle will be descending through the arms. The probability is uncertain, but it is above zero," Elon explained.