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These actually work. I have some similar in my shed that I used http://molechasersinternational.com/
since we are throwing ideas out, here's one for ya. take a water hose and filler the hole up with water. Take an old extension cord and strip the female end off to two bare stripped wires. Ok, you know where I'm going with this. Plug it in at the right time, but stay clear of the water. You may have to flip your breaker afterwards. Don't try this at home! It's a joke and will most likely get the person electrocuted.
I think the gopher may have tried to get away and dragged it further into the tunnel.