A Cold Tunnel                                          -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        SW     -      -

This is a tunnel leading somewhere underneath the Castle of the Seelie. 
The walls are chilly to the touch, and the ground is very hard.  The ceiling
was cut low, but there is room for five people to walk down the hall without
bumping in to each other.  The tunnel was made unmistakably cleanly, and the
walls are very flat, almost as if some arcane magic had caused this.  To the
southwest and to the north is more of the tunnel.