"On a side note, upon passing through the tunnel, on one side is a \"window\" showing the heart of a large factory. It appears to be an enormous engine with troll slaves busy laboring away inside."@en . . . . . "The Pipe"@en . . . "On a side note, upon passing through the tunnel, on one side is a \"window\" showing the heart of a large factory. It appears to be an enormous engine with troll slaves busy laboring away inside."@en .