From the mine's entrance, a flight of steps leads down about 20 feet to a stone passageway about 8 feet wide with a ceiling only about 6 feet high. Tall characters will have to stoop. Only a little sunlight penetrates this far from the doorway above and behind you. You do have a torch or a will-o-the-wisp spell going, of course, so you can see, but very dimly.

First you decide on a marching order and write it down. Then you determine that the tunnel is damp, and it smells musty. You may either check for traps or just walk on down the stairs.