"Which one?” whispered Sual Av to him.
"We'll each take one, trace it and come back and meet here,” Thorn muttered. “One of them ought to lead to the dungeons."
Thorn crawled into the right drain tube. It was so small he had to inch forward by creeping. It slanted upward also.
Blue light finally glimmered ahead. Thorn extinguished his lamp and stealthily crawled on. He came to the end of the drain, which was closed by inertrum bars set in the cement, over his head.
Cautiously he peered upward. The grating over him was set in the cement paving of a large court surrounded on all sides by the dark, towering mass of the citadel. Krypton lamps cast a blue glow on spaceships parked in the court, three swift-lined small cruisers. Two armed guards paced to and fro beside them.
"Haskell Trask's personal spacecruisers,” Thorn muttered to himself.
He backed down to the fork where the drains diverged. Gunner Welk and Sual Av were just emerging there also.
"The dungeons are up there at the end of that pipe!” Sual Av whispered excitedly, pointing to the second drain.
"Come on, then,” Thorn said swiftly.
He led the way, all three of them crawling up the narrow pipe the Venusian had explored. Its opening, also, was barred by inertrum bars set in the cement.