The sandfish doesn't fight the sand; it works with it.
In the long conversation between life and machine, engineers have turned to the desert for wisdom — watching how the sandfish, a small reptile of North African dunes, swims through loose sand as if it were water. By translating that ancient biological solution into rover wheel design, researchers are attempting to free future Mars missions from one of the Red Planet's most persistent obstacles: the treacherous, energy-consuming grip of sand. It is a reminder that nature, given enough time, tends to solve the problems we are only beginning to ask.
- Mars rovers have long been held hostage by sand — wheels spin, sink, and drain energy, turning dunes from terrain into traps.
- The sandfish, a desert reptile that undulates through loose granular material with liquid ease, offered engineers a model that millions of years of evolution had already stress-tested.
- A new wheel system mimics the sandfish's swimming motion, allowing rovers to work with sand rather than fight it — reducing energy loss and the risk of getting stuck.
- Entire regions of Mars — geologically rich dune fields and soft regolith zones — have been off-limits to exploration; these wheels could open them.
- The development signals a broader philosophical turn in engineering: stop imposing human logic on alien environments, and start listening to what life on Earth has already figured out.
Engineers designing the next generation of Mars rovers have found an unlikely collaborator: the sandfish, a small reptile native to the dunes of North Africa and the Middle East. The creature moves through loose sand not by pushing against it, but by undulating its body in a fluid swimming motion — and researchers have now built that same principle into rover wheels.
The challenge has always been straightforward and stubborn. Traditional wheel designs, built around assumptions suited to firmer ground, sink and spin in the granular terrain that covers much of Mars. They waste energy and risk leaving a rover stranded. By studying how the sandfish navigates the same kind of loose, shifting material, engineers developed a wheel system that mimics reptilian locomotion — engaging with sand rather than resisting it, and moving with something closer to a swim than a roll.
The practical consequences for Mars exploration are considerable. Dunes and soft regolith have historically been hazards to route around, not terrain to investigate. Rovers equipped with sand-swimming wheels could reach geologically significant areas that current missions must bypass entirely, potentially revealing new details about the planet's history.
But the development also reflects something larger. There is a growing recognition among planetary engineers that nature has spent far longer solving environmental problems than we have. The sandfish, the camel, the gecko — each represents a refined answer to a specific challenge. These rovers are not yet ready for deployment, but as Mars ambitions grow, machines that move the way life on Earth has learned to move may prove essential to going where we have never gone.
Engineers working on the next generation of Mars rovers have borrowed a trick from the desert. They've watched how sandfish—small reptiles that live in the dunes of North Africa and the Middle East—move through loose sand with almost liquid grace, and they've built that motion into wheels.
The problem Mars rovers have always faced is simple: sand is treacherous. Wheels designed for Earth terrain sink, spin, and waste energy fighting their way across dunes. A rover meant to explore the Red Planet's surface needs to cover ground efficiently, and traditional wheel designs do neither. Engineers realized that if they could understand how sandfish propel themselves through granular material—undulating their bodies in a swimming motion rather than pushing against solid ground—they might design rovers that move the same way.
The result is a wheel system that mimics this reptilian locomotion. Instead of relying on rigid contact with the sand, the new design allows the rover to move in a way that more closely resembles swimming than rolling. The wheels engage with the loose material around them using a motion inspired by how the sandfish's body moves through dunes, reducing the energy needed to traverse difficult terrain and decreasing the likelihood of getting stuck.
This is biomimetic engineering at its most practical. Rather than imposing human assumptions about how machines should move, the designers looked at an animal that has spent millions of years perfecting movement through the exact environment Mars rovers need to navigate. The sandfish doesn't fight the sand; it works with it. The new rover wheels operate on the same principle.
The implications for Mars exploration are significant. Previous rovers have been constrained by the terrain they could safely cross. Dunes, soft regolith, and other sandy areas have been obstacles to avoid rather than terrain to explore. With wheels that can swim through sand, future missions could access regions that were previously too risky or energy-intensive to reach. Scientists could study areas of geological interest that current rovers must bypass, potentially uncovering new information about Mars's past and present.
The technology also speaks to a broader shift in how engineers approach planetary exploration. Rather than building machines that impose their own logic on alien environments, there's growing recognition that nature has already solved many of the problems we're trying to solve. A sandfish has navigated loose sand for millennia. A camel moves efficiently across dunes. A gecko climbs vertical surfaces. Each of these creatures represents a solution to a specific problem, and each solution is available to us if we're willing to look closely and think creatively about how to adapt it.
These rovers aren't ready for deployment yet, but the development is advancing. As Mars missions become more ambitious and scientists identify new regions worth exploring, rovers that can move like sandfish swimming through dunes could become essential tools. The Red Planet's surface is vast and largely unexplored. Giving our machines the ability to move through sand the way life on Earth has learned to do it might be the key to reaching places we've never been.
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Why does sand pose such a problem for traditional rover wheels? It seems like it should be simpler than rocky terrain.
Sand is deceptive. It doesn't provide the firm contact a wheel needs to grip and push. The wheel sinks, the sand shifts around it, and the rover wastes enormous amounts of energy just trying to move forward. It's like trying to run on a beach—you're constantly fighting the ground beneath you.
And the sandfish solves this how?
By not fighting at all. The sandfish undulates through sand almost like it's swimming through water. Its body moves in waves, and it uses that motion to propel itself without sinking. The sand flows around it rather than resisting it.
So the engineers just copied that motion into a wheel?
Not exactly copied—adapted. They studied how the sandfish moves and translated that principle into a wheel system that engages with sand in a similar way. It's not a wheel in the traditional sense. It's a mechanism that mimics that swimming motion.
What changes for Mars exploration if this works?
Everything, potentially. Right now, rovers have to avoid sandy regions because they're too risky. With wheels that can swim through sand, those areas become accessible. Scientists could study dunes, explore valleys, reach geological features that are currently off-limits.
Is this the first time engineers have looked to nature for solutions like this?
Not at all. But it's becoming more common. Geckos inspired adhesive technology. Whale fins changed how we design turbines. Nature has been solving engineering problems for billions of years. We're finally paying attention.