Robert Gruenenwald, better known as Tunnel Bob, is a resident of Madison, Wisconsin, who allegedly[according to whom?]
[4] Bob denies sleeping in the tunnels due to danger, stating that "you might wake up dead."
[5] He has been cited and fined multiple times for "unauthorized presence".
Tunnel Bob was the inspiration for The Kingkiller Chronicle character Auri.
Author Patrick Rothfuss was a resident of Madison, and his father told him stories of Tunnel Bob.