Tests show how a Mars drill could clear rock chips to reach buried ice

A compressed-gas system for the RedWater project matched experiments well enough to guide drilling plans for extracting ice on Mars.

Editorial illustration — not from the study.

The RedWater system is designed to drill through Martian soil and rock to reach buried water ice, then clear the resulting borehole with compressed gas. This approach avoids the heavy water-based mixtures commonly used to move drill cuttings on Earth, which could be difficult to supply and operate on Mars.

The study’s model estimates the minimum gas flow needed to transport the chips. Researchers compared it with established methods for moving solids through vertical pipes, tested it in a dedicated vacuum setup, and ran two tests with the complete RedWater system. The predictions showed reasonable agreement with the experiments.

How the gas clearing worked

The model estimated the minimum compressed-gas flow needed to carry drill cuttings out of a Martian borehole. It was tested under a range of Mars-relevant conditions, in a dedicated vacuum experiment and in two tests using the end-to-end RedWater system. The model showed reasonable agreement with the experimental results when predicting gas-flow requirements.

Why buried ice matters

Buried mid-latitude ice could provide water for life support and propellant production during future Mars exploration. A low-mass, gas-driven way to remove drill cuttings could help a drilling system reach and extract that ice without relying on the heavy water-based slurries used in many terrestrial operations. The study provides engineering guidance for mission designs that use pneumatic drilling and mining.

Evidence and open questions

This is a modeling and experimental study, not a demonstration of ice extraction on Mars. The model was checked in a vacuum test and in two tests with the RedWater system, but the abstract does not give the numerical results, test durations, or the range of conditions in detail. Its calculations also adapt correlations developed for pneumatic vertical conveying on Earth, so further testing would be needed to assess performance in an actual Martian drilling operation.

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