Okay, not exactly blow it up. They want to ram it with a probe in order to penetrate the surface to find ice. Note to NASA: Ice isn’t that hard to make. You don’t have to damage the moon to find some. Here’s a brief explanation from Discover website:
The idea is that over millions and billions of years, a lot of comets have hit the Moon. The water from these comets hits the surface and sublimates away… but if any settles at the bottoms of deep craters near the Moon’s poles, these permanently shadowed regions can act as a refrigerator, keeping the water from disappearing. It can stay there, locked up as ice, for a long, long time. Some estimates indicate there could be billions of tons of ice near the Moon’s south pole.
Detecting that water is tough. Radar results have been inconclusive, with some people saying there’s lots of water, and others saying there’s none at all. By impacting a probe there, any ice located at the impact site will be shot up above the lunar surface, where sunlight will break it up into O+– molecules, which can be detected. and OH
To that I say, my cat’s name is Mittens!