"Fifty thousand feet, sir."

"Good. That measures it. And those last bombs have knocked the devil out of whatever machinery they've got down there. Now we'll give them a real taste of gas. Two of the green ones there, men. Put ten miles of cable on the drums. Get that hoisting frame into place."

But night had come, though searchlights outside the crater and floodlights within had robbed the night of its terror, when Smithy, with Culver beside him, climbed over the guard rail of the lift that hung waiting just over the pit.

A gas mask covered his entire face. Through its round eye plates he looked at the others who crowded about him. Grotesque, almost ludicrous—twenty men, armed with clumsy sub-machine guns; the others would follow later. A searchlight was on a tripod at the center, and a spool of electric cable.

The light sizzled into life and swung slowly about. Then the platform jarred, and the spool of cable began slowly to unwind. Beside him Colonel Culver was returning the salute of an officer outside on the ashy ground. Smithy raised his hand, but the brink of that pit had moved swiftly up—there was nothing before him but a glassy wall.

Reconnaissance? Suicide? One word was as good as another. But he was going down—down where Dean Rawson had gone—down where there was a debt to be paid.


CHAPTER XXII

The Red-Flowering Vine