Why did not some one rise up to detain him? Surely he was watched. He experienced an uncanny sense of being allowed to proceed just so far, when invisible fingers would pounce upon him, to hurl him back. The soot still lay on his face; he had seen no bucket and water. At the mouth of a tunnel-like aperture, he hesitated, but still no one sprang in front, or glided up from behind to interfere with his progress. He went on; a perpendicular iron ladder enabled him to reach an open space on the deserted lower deck. Another ladder led to the upper deck. Could he mount it and still escape detection? And in that case--to what end.