“The two agents broke into a run, following the tunnel down, deeper, noting a second, a third, and even more clusters of dynamite along the cavern walls, all spooling them down, ever down, into the shadows.
As they ran, they smelt the smoke. It filled the shaft like a thin haze, and stank of grease. The shaft curved away and then, around the bend, the rails came to an end. Beyond the bumper, where a lone cart clunked softly against the timber with the rhythm of the chaindrive, a vast blackness stretched out. A dozen candles melted into pools of wax along the edges of the shaft, and the string of gaslights came to an end, their light barely penetrating past the cavernous throat.