Scientists are starting to cast doubts on whether the Moon has significant water ice deposits on its south pole:
Hypothesised deposits of lunar water-ice have figured in Nasa's planning for future Moon landings. This resource would be invaluable for supplying bases and making fuel for propelling spacecraft beyond the Moon.
The study in Nature journal suggests radar echoes thought to be from frozen water could be from rocky debris.
The simplest explanation is that we're looking at a signature due to [impact debris] from the crater and not some strange signature due to water ice.