So the discovered traces of water - ice suggest some underground ice was recently exposed and that there must be some mechanism to explain how the surface was disturbed in this way. (newsweek.com)
In other parts, there're traces of water planes and a helicopter with mini machine games. (igcritic.com)
Take LADEE, which detected traces of water in the lunar atmosphere that were probably carried there by meteorites. (scientificamerican.com)