India Chandrayaan-2 orbiter has made a landmark discovery, detecting strong evidence of subsurface water ice buried beneath the permanently shadowed craters of the Moon south pole — a finding that could prove crucial for future lunar habitats and in-situ resource utilisation by space agencies worldwide.
How the Discovery Was Made
The breakthrough came from Chandrayaan-2 Dual Frequency Synthetic Aperture Radar (DFSAR), which ISRO describes as "the first fully polarimetric synthetic aperture radar designed to study the Moon in both L-band and S-band frequencies." The instrument detected radar signatures consistent with water ice deposits buried beneath the surface of craters near the lunar south pole, particularly inside the 1.1-kilometre-wide Faustini crater.
The findings, published in May 2026, add to the growing body of evidence that the Moon polar regions harbour significant water resources. Previous missions, including NASA LCROSS and SOFIA, had detected water molecules on the sunlit surface, but Chandrayaan-2 radar data provides the most detailed subsurface mapping yet.
Why Water on the Moon Matters
Water is the single most valuable resource for sustained lunar exploration. It can be split into hydrogen and oxygen for rocket fuel, used for life support systems, and provide radiation shielding for habitats. The ability to extract water locally — rather than launching it from Earth at a cost of thousands of dollars per kilogram — is widely considered the key to establishing permanent human presence on the Moon.
NASA Artemis programme, which aims to land astronauts near the lunar south pole, and China International Lunar Research Station plans both depend on access to polar water ice. The Chandrayaan-2 data provides critical information for selecting future landing sites.
India Growing Space Prowess
This discovery cements ISRO position as a serious player in planetary science. India space agency has achieved multiple high-profile successes in recent years, including the Chandrayaan-3 soft landing near the south pole in 2023 and the Aditya-L1 solar observation mission. The Chandrayaan-2 orbiter, despite the Vikram lander unsuccessful landing attempt in 2019, has proven to be one of the most productive lunar science missions in history.
India Gaganyaan human spaceflight programme is progressing toward its first crewed mission, and ISRO has announced plans for a Chandrayaan-4 sample return mission in partnership with Japan JAXA. The subsurface water ice discovery adds momentum to India case for a greater role in international lunar exploration efforts.
Sources: ISRO Press Release, Business Today, Firstpost, India TV News, IndianWeb2
