“That’s One-eyed Conro,” Fighting Jack confided to Drigg. “Terrible man in a dustup, thumbs ready all’t‘time. Trying to even the score you see for the one he had gouged out.”

Conro glared out of his single reddened eye until they had climbed up beside him, then ground the train of wagons forward.

“And how’s the face?” Fighting Jack asked.

“Sand.” One-eyed Conro spat a globe of tobacco into the darkness. “Still sand, sand. Loose at the top so Mr. Washington has dropped the pressure so she won’t blow, so now there’s plenty of water at the bottom and all the pumps are working.”

“‘Tis the air pressure you see,” Fighting Jack explained to Drigg as though the messenger were interested, which he was not. “We’re out under’t’ocean here with ten, twenty fathoms of water over our heads and that water trying to push down through the sand and get’t‘us all the time, you see. So we raise the air pressure to keep it out. But seeing as how this tunnel is thirty feet high there is a difference in the pressure from top to bottom and that’s a problem. When we raise the pressure to keep things all nice at’t’top, why then the water seeps in at’t‘bottom where the pressure is lower and we’re like’t’swim. But, mind you, if we was to raise the pressure so the water is kept out at’t‘bottom why then there is too much pressure at’t’top and there is a possibility of blowing a hole right through to the ocean bottom and letting all the waters of the world down upon our heads. But don’t you worry about it.”

Drigg could do nothing else. He found, that for some inexplicable reason his hands were shaking so that he had to grip the chain about his wrist tightly so it did not rattle. All too soon the train began to slow and the end of the tunnel appeared clearly ahead. A hulking metal shield that sealed off the workers from the virgin earth outside and enabled them to attack it through door-like openings that pierced the steel.