15) In the north wall is a two hex-wide passageway. After 3 hexes it becomes a stairway leading down. The stairway continues to go down 10 hexes until it comes to a landing with a door to the north and a passageway that turns to the west.
If the party tries the door, go to 16.
If the party goes west down the passageway (2 hexes wide), go to 17
or go back to 14.