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Home During the same field test, the DuAxel rover separates into two single-axled robots so that one can rappel down a slope too steep for conventional rovers. (NASA/JPL-Caltech/J.D. Gammell) During the same field test, the DuAxel rover separates into two single-axled robots so that one can rappel down a slope too steep for conventional rovers. (NASA/JPL-Caltech/J.D. Gammell)

During the same field test, the DuAxel rover separates into two single-axled robots so that one can rappel down a slope too steep for conventional rovers. (NASA/JPL-Caltech/J.D. Gammell)

During the same field test, the DuAxel rover separates into two single-axled robots so that one can rappel down a slope too steep for conventional rovers. (NASA/JPL-Caltech/J.D. Gammell)

During the same field test, the DuAxel rover separates into two single-axled robots so that one can rappel down a slope too steep for conventional rovers. (NASA/JPL-Caltech/J.D. Gammell)

The DuAxel rover is seen here participating in field tests in the Mojave Desert. The four-wheeled rover is composed of two Axel robots. One part anchors itself in place while the other uses a tether to explore otherwise inaccessible terrain. (NASA/JPL-Caltech/J.D. Gammell)
The two-wheeled Axel descends the slope while tethered to its counterpart anchored above the slope. The tether serves as a climbing rope of sorts while also providing power and a means of communication. (NASA/JPL-Caltech/J.D. Gammell)