In December, buttressed by his conviction and advances in homemade rocketry, “Mad” Mike Hughes flipped on a camera and fantasized about the moment when he shows mankind that it lives on a verdant disk.

The plan: Float dozens of miles high in a balloon, then fly a rocket to the Karman line, the 62-mile-high barrier that separates the atmosphere and the cold vacuum of space, filming the entire way. “For three hours, the world stops,” Hughes said during a live stream, imagining the reaction.

Hughes, a self-styled daredevil, flat-Earth theorist and limousine-jumping stuntman, died Saturday when his crudely built contraption propelled him on a column of steam, spiraled through the air and cratered into the sagebrush outside Barstow, Calif. He was 64.

Justin Chapman, a freelance reporter, witnessed the launch while reporting a longer story on Hughes. The rocket’s green parachute tore away moments after takeoff, sending the crowd of 50 or so people into a panic, he said.

“Everyone was just stunned and didn’t know what to do,” he told The Washington Post on Sunday. “They were silent for a long time.”

Hughes’s support team went to inspect the crash site about a half mile away, Chapman said, and returned with the harrowing news: Hughes was dead, the rocket had pancaked, and the other three parachutes never deployed.

“It was unsuccessful, and he passed away,” longtime collaborator and friend Waldo Stakes told the Associated Press.

Stakes declined to say what he thinks went wrong. Hughes had at least one successful launch, in which he was strapped to a rocket bearing the words “FLAT EARTH.”

“It’s a daredevil thing,” Stakes said in a short phone interview with The Post on Sunday, describing the danger and Hughes’s experience building seven rockets. “He was one of the smartest guys I’ve ever met.”

The rockets he had ridden are not designed to reach space; Hughes’s goal was to ride past the 5,000 foot mark on Saturday. But his previous launches were an apparent step toward his ultimate vehicle.

It was a tragic end for Hughes, perhaps the most visible and colorful advocate of the theory that Earth isn’t a sapphire-and-emerald globe revolving around a massive star but rather a flat plane with a tiny sun above it. While there is no one hypothesis for what the flat Earth is supposed to look like, many believers envision a flat disk ringed by sea ice, which naturally holds the oceans in.

He dedicated the past several years of his life to proving the theory from a high perch — an ambitious goal that began in the front seat of a limousine.

Hughes achieved some fame in 2002 when he soared in a 103-foot jump in a Lincoln Town Car stretch limo, earning a Guinness world record. Years later, he looked to re-create a failed jump by legendary daredevil Evel Knievel, who in 1974 tried to vault Idaho’s Snake River Canyon in a similarly designed steam-powered rocket. Knievel’s chute deployed early, and he missed the mark.

That interest sparked communication between Hughes and the Federal Aviation Administration sometime around 2010, said James Van Laak, who was then a senior official in the agency’s Office of Commercial Space Transportation.

The two struck up an odd-couple, phone-based friendship, with Hughes as the swaggering stuntman paranoid of the federal government and Van Laak the fed trying to help him find a way to legally launch the rocket, he told The Post on Sunday.

After Van Laak met with the FAA’s general counsel, the agency determined that it wasn’t quite a rocket launch by definition, since a ramp would be the main propulsion system. That helped avoid complicated safety reviews, and Hughes agreed to keep local safety officials in the loop, Van Laak said.

They last spoke in 2012, he said. Two years later, Hughes flew a quarter-mile over Winkelman, Ariz., in a flight that ended with Hughes being dragged from the remains of the rocket. He watched another daredevil make the Snake River Canyon jump in 2016.

In March 2018, Hughes rode his garage-made rocket 1,875 feet above the Mojave Desert, reaching a speed of 350 mph, the AP reported. It was the next step in his mission to photograph the world. “It’ll shut the door on this ball Earth,” Hughes said then.

But whether the planet is a flat plane, or a globe, is something he openly wrestled with, telling CBS News that he was both confident in what he would find but open to other ideas.

“I expect to see a flat disk up there,” he said of his ultimate goal to get to space, months after his 2018 launch. “I don’t have an agenda. If it’s a round Earth or a ball, I’m going to come down and say, ‘Hey, guys, I’m bad. It’s a ball, okay?’ ”

Hughes recently signed on with the Science Channel to document his project on the television program “Homemade Astronauts,” the channel, which is part of Discovery, said in a statement.

“Our thoughts and prayers go out to his family and friends during this difficult time. It was always his dream to do this launch, and Science Channel was there to chronicle his journey,” the Science Channel said.

But a spokeswoman for the network wouldn’t say whether producers asked Hughes to rein in his flat-Earth commentary for a channel that has science in its name — and, at least theoretically, would want to assure viewers that Earth is, in fact, round.

In a promo video posted on Discovery’s website ahead of the launch, Hughes does not mention his beliefs when he explains why he embarked on his now-tragic mission.

“It’s to convince people they can do things extraordinary with their lives,” he said. “Maybe it pushes people to do things they wouldn’t normally do with their lives that will maybe inspire someone else."

Then Hughes expressed optimism about the takeoff.

“We look forward to Saturday,” he said.

Avi Selk contributed to this report, which has been updated.

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