In his tunnels, Gopher has a workshop full of tools, a bedroom, other rooms, as well as railways like that of a mine. There are also lanterns for light. There are a lot of tunnels that are just like hallways. They are shored up, and look a lot like mine shafts.
Sometimes other characters accidently fall into his tunnels, as well as Gopher himself. Other characters sometimes also use his tunnels to get around, or for other purposes.