Penetrator probe missiles designed to be fired from an orbiting, robotic space mothership into the dark side of the Moon have been tested on targets in Wales. The moon harpoons are expected to confirm the exact makeup of the lunar crust, possibly by the deployment of robotic moon-tunnelling mole cruisers.
More: http://www.theregister.co.uk/2008/06/09/moon_mole_cruiser_trials/