If you're talking about Animal Crossing: City Folk, here's how. Step I: Around 8:00 P.M. every night (not every night, but it's good to check) go to the city. Step II: Go to the far right corner on the sidewalk (near the road, not far right up to the fortune teller's). Step III: If the right day (Mon, Tue, Wed), the cones on the sidewalk will be moved to where you can enter the tunnel. Step IV: When inside, you shoud see Resetti the mole (or his brother Don, depending on how many times you enter). Step V: Resetti will scold you, telling you you shoud not be in the Reset Surveillance Center (or the RSC). Just ignore him and talk to him again. Talk to him until he says kids are always asking for things (and something else), and then he gives you something. That "Something" is the Silver Shov