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June 12 marked the official 40th anniversary of Raiders of the Lost Ark, the first film in the Indiana Jones epic adventure series starring Harrison Ford.

After playing Han Solo in Star Wars, Ford rose to popularity, and director Steven Spielberg tapped him for the whip-cracking Indiana Jones role after Tom Selleck backed out. Some fans may not realize that the actor performed many of his own stunts, including that famous boulder chase. And Spielberg once called himself an “idiot” for putting Ford in that situation.

Harrison Ford as Indiana Jones running from a boulder in 'Raiders of the Lost Ark'
Harrison Ford as Indiana Jones running from a boulder in ‘Raiders of the Lost Ark’ | CBS via Getty Images

Steven Spielberg shot ‘Raiders’ boulder scene without a stunt double

There’s a small celebration happening online for the Indiana Jones franchise. Life Magazine ran a special issue highlighting Raiders of the Lost Ark and dug into the movie’s backstory about the cast, director, filming locations, and stunts. In addition, there’s an anecdote pulled from Steven Spielberg’s 2017 essay published in American Cinematographer, where he discusses shooting the boulder scene without a stunt person for Harrison Ford.

Spielberg explained that they had to take proper safety precautions to prevent injuries. But filming Ford directly from the front worked best for the scene “because the rock was more effective chasing Harrison with Harrison running toward the camera, it just didn’t work as well having him doubled.” Remember, this was in 1981 before fancy CGI and editing technology. Still, it was risky.

“A double would have cheated his head down, so Harrison volunteered to do it himself,” wrote Spielberg. “He succeeded. There were five shots of the rock from five different angles — each one done separately, each one done twice — so Harrison had to race the rock ten times. He won ten times — and beat the odds. He was lucky — and I was an idiot for letting him try it.”

The ‘Raiders of the Lost Ark’ boulder weighed 300 pounds

As a viewer, it’s easy to imagine the adrenaline and fear that comes along with being chased by a massive boulder. But, for Ford and the Raiders of the Lost Ark crew, it was real. Though it was only a fake prop, Spielberg revealed it could have caused real damage to anyone in its path. Like death-level damage. He said it stood 12 feet and weighed 300 pounds.

“We went to great lengths to make a 12-foot rock out of fiberglass and wood and plaster precisely so that it wouldn’t weigh as much as a real 12-foot boulder,” Spielberg recalled. “So whether it weighed 300 pounds, which it did, or whether it weighed 80 tons, as it would have, it could still have done bodily harm to anyone falling beneath it…”

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To operate it, they used a special rod hidden among rubber stalagmites on set. The entire contraption required a fully constructed set that could accommodate all its moving parts and enable the fake boulder to move 40 yards.

Fast forward to 2021, and making that scene happen would be a different undertaking. Fans will get to see Ford don his famous fedora once more as Dr. Jones in Indiana Jones 5, which is due in 2022. While it’s unknown whether he’ll have a stunt double, it’s highly doubtful he’ll have to dodge any colossal stones.