Pure ice would require a 2,500 times increase in water proportions. That’s a big increase. It does seem reasonable that sub soil not heated to 260 degrees ever

Pure ice would require a 2,500 times increase in water proportions. That’s a big increase. It does seem reasonable that sub soil not heated to 260 degrees every two weeks for two weeks at a time would contain a lot more water. But when Lunar Prospector was crashed into Crater Shoemaker, the plume was mostly soil never exposed to sunlight and water density was minuscule.