How 'Project Hail Mary' Is Reimagining Zero-G Spacewalks Through Manual Engineering

One of the key components of shooting any space movie is the idea that characters are going to float around.

But filming weightlessness has always been a battle between physics and frame rates. And none of them is easy. At times, it can look fake and take people out of the movie.

From the vomit comet of Apollo 13 to the complex robotic arms of Gravity, directors are constantly searching for the "perfect" way to simulate the void of space.

And now, with Project Hail Mary, they're doing it differently again.

In a recent behind-the-scenes look from Adam Savage’s Tested, we get a deep dissection into the stunt department of Project Hail Mary.

Let's dive in.

The Problem with "Z-Space"

Okay, apologies for all the physics jargon, but if you watch the video, you'll understand it.

Here's the basic problem of making a space movie: When Ryan Gosling’s character needs to move outside the ship, the production needs to account for movement in X, Y, and Z axes. And in space, those points can change or turn at any moment, because we don't have gravity.

Sure, you could do this with CGI, but the movie made its bets on a visceral version of space and its problems.

But conventional winch systems can often feel "robotic" or limited by pre-programmed paths.

So how do you solve for all these variables?

Stunt Coordinator Eunice Huthart explained that while Project Hail Mary might not be the most stunt-heavy film in terms of high-octane fights, it is perhaps the most technically complex.

The team had to redesign their entire approach to give the actors complete freedom of movement.

The "Spinner Rig"

The heart of the production's EVA (Extra-Vehicular Activity) sequences is a custom-designed gantry and spinner rig. This rig allows for movement on all those axes and allows a stunt team to control them.

Unlike many modern rigs that rely on motorized winches, this system is entirely manual.

Why choose to operate things manually?

• Reactive Performance: The rope team acts as an extension of the performer. They anticipate his movements, providing counterbalance and tension in real-time.
• On-the-Fly Adjustments: If an actor or director wants to change a beat, moving two feet forward or flipping upside down mid-sequence, the team can adjust instantly without reprogramming software.
• The "Dance": The rig requires a three-person team working in perfect synchronization:
  • The Lead: Controls the height (Up/Down).
  • The Traveler: Controls lateral movement (Left/Right).
  • The Performer: Uses core strength to manipulate the "spinner" harness to rotate and flip.

Credit: Adam Savage’s Tested | YouTube

Why Does This Look Better?

They pushed the technical side of the industry simply because the story demanded it. They were trying to define a grounded look for the movie and realized the best way wasn't CGI, but going back to moving people manually in order to have more control.

Here's why is does look so good:

• Contact Points Matter: To sell the illusion of zero-G, the performers always maintain a "point of contact" with the ship. This provides a physical anchor that makes the floating movement feel grounded in reality.
• Counterbalance is Key: The rig uses long-leg positioning to provide more counterbalance. If the performer tucks their legs in, they become "top-heavy," allowing for faster spins and tumbles, just like in space.
• Communication is Mission Critical: Because the rig is manual, the communication between the stunt team and the actor must be fast and clear. They aren't just pulling ropes; they are watching the actor's every twitch to ensure safety and fluid motion. It takes a lot of practice to get it right.

The Physicality of the Performance

Putting this rig on is not easy. It's a real full-body workout. But it also looks amazing. If you have seen the movie or just watched the clips, you can see how malleable this all is and how realistic it feels like Gosling is moving.

Adam Savage quickly realizes the intense cardio required just to maintain "neutral" buoyancy in the rig.

For the stunt doubles, like Ryan Gosling’s double Ben, this means spending hours suspended in the air, performing story beats and emotional beats with their bodies while fighting the weight of the suit and the harness.

Not easy! But it does look great!

Summing It All Up

What I love about this movie and why I think it's doing gangbusters at the box office is that it feels realand it also feels so fresh, like things were done differently for the first time. And people connect with that. Even when it's a space walk.

Let me know what you think in the comments.