They went along tunnel after winding tunnel, losing all sense of direction in the wet hollow dark. Corun had a sudden nightmare feeling that they might wander down here forever, blundering from cave to empty cave while eternity grayed. "Where are we going?" asked someone impatiently. "Where are Xanthi to fight?" "I don't know," snapped Corun. They came suddenly into another broad cavern, beyond which was another barred door. Four Xanthi stood guard in front of it. They never had a chance--the air was suddenly full of hurled weapons, and they were buried under a pile of edged steel. Corun searched the bodies but found no keys. In the murk beyond, he could dimly see boxes and barrels reaching into fathomless distances, but the door was held fast. Of course--Tsathu would never trust his men-at-arms with entrance to the devil-powder. The corsair snarled and grabbed a bar with both hands. "Pull, men of Umlotu!" he shouted. "Pull!" They swarmed close, thirty-odd big blue men with the strength of hate in them, clutching the cell bars, grabbing each other's waists, heaving with a force that shrieked through the iron. "Pull!" The lock burst and they staggered back as the door swung wide. Instantly Corun was inside, ripping open a box and laughing aloud to see the black grains that filled it. For a wild moment he thought of plunging a brand into the powder and going up in flame and thunder with the castle. Coldness returned--he checked himself and looked around for fuses. His followers would not have permitted him to commit a suicide that involved them. And after all--the longer he lived, the more enemies he'd have a chance to cut down personally. "I've heard talk of this stuff," said one of the men nervously. "Is it true that setting fire to it releases a demon?" "Aye." Corun found the long rope-like fuses coiled in a box. He knotted several together and put one end into the powder. The ignition of one container would quickly set off the rest--and the cavern was huge, and filled with many shiploads of sleeping hell. "If we can fight our way to our ship, and get clear before the fire reaches the powder--" began the Umlotuan. "We can try that, I suppose," said Corun. He estimated the burning time of his fuse from memories of the use he'd seen the Xanthi make of the devil-powder. Yes, there would be a fair allowance for escape, though he doubted that they would ever reach the strand alive. He touched a stick from the fire to the end of the fuse. It began to sputter, a red spark creeping along it toward the open box. "Let's go!" shouted Corun. They pounded along the tunnel, heedless of direction. There should be an upward-leading ramp somewhere--ah! There it was! Up its length they raced, past levels of the dungeons toward the main floor of the castle. At the end, there was a brighter blue light than they had seen below. Up--up! Up--and out! * * * * *