You all arrive in a surprisingly similar dead end tunnel.  Other than the different smell of the air you wouldn't know you had travelled anywhere at all.  The tunnel is the same size, about 20 feet wide and 20 feet high.  The dimensions are very uniform the walls ceiling and floor are all impressively flat, straight, and square, which is uncommon for underground tunnels.

A few seconds after everyone arrives safely the shimmering portal disappears leaving the normal looking stone wall in its place.  There's very little sense of disorientation and you're ready to press onward.  The retriever spider leads the way once more.

Roughly 1000 feet down the tunnel you come upon some construction.  The walls of the tunnel have been extended inward to form a large circle sort of like a doorway.  It is rimmed with a band of metal.  There are large durable metal fittings on one side with very sturdy pins in them.  They look like unfinished hinges.  On the other side of the vertical circle from the fittings are 3 holes drilled through the metal rim and into the surrounding rock.  Each hole is big enough to fit your arm into up to your elbow.

The spider does not pay this construction any attention.  It strides right on through.
This message was last edited by the GM at 06:10, Thu 14 Feb 2013.