A systematic review published in 2026 evaluated 27 studies that simulated or experimentally tested lunar water-extraction methods.[1] It identified major unresolved uncertainties in the physical form, concentration, lateral distribution, and vertical distribution of polar ice, while existing orbital data and the single LCROSS surface-impact measurement remain insufficient for selecting a reliable mining site.[2][4] The review also found that many studies do not evaluate the complete extraction chain, including excavation, vapour capture, purification, and scalable surface operation.[8]
For habitation, water is simultaneously life support, radiation shielding, agriculture feedstock, and the source of hydrogen-oxygen propellant. The current evidence indicates that ice may be finely disseminated beneath a dry surface layer extending as much as 1 metre, while most planned sensors cannot reliably detect ice deeper than approximately 80–100 centimetres.[3] Extraction performance therefore depends on deposit conditions that are not yet known; power, dust, cryogenic operation, mobility, contamination control, and integrated vapour capture remain major engineering risks.[7][8] A failed water campaign would threaten crew survival, industrial expansion, closed-loop life support, and the Ark’s ability to preserve civilisation independently of Earth.
The Ark team should treat lunar water as a strategic hypothesis, not an established reserve. Prioritise a ground-truth prospecting programme in permanently shadowed regions; require measurements of concentration, grain-scale form, depth, volatiles, sulphur contamination, and recoverable yield; and evaluate extraction, capture, purification, storage, recycling, and propellant production as one end-to-end system. No habitat architecture should receive final commitment until large-scale integrated demonstrations operate in representative lunar conditions, and all life-support designs should retain multi-year reserves plus non-lunar contingency supply pathways.[2][4][7][8]