Damned afraid." For perhaps two hundred paces we skirted the base of the wall.

We came abruptly to an opening, an oblong passageway fully fifty foot wide by twice as high.

At its entrance the mellow, saffron light was cut off as though by an invisible screen.

The tunnel itself was filled with a dim grayish blue luster.

For an instant we contemplated it.
"I wouldn't care to be caught in there by any rush," I hesitated.
"There's not much good in thinking of that now," said Drake, grimly.
"A few chances more or less in a joint of this kind is nothing between friends, Goodwin; take it from me.