Pitt gently eased the throttle lever forward, directing the sub's movement by angling and tilting the three thrusters with the handgrip controls, dodging beneath the giant rudder and banking around the two starboard screws. Like some nocturnal flying machine, the submersible slipped around the three-bladed bronze propellers that spanned the watery gloom like great, beautifully curved fans. The Sea Dog II continued silently through the water, which became an eerie opaque green.

The bottom appeared as distant land through a fog. Assorted trash dumped off ships and the dock over the years lay partially embedded in the silt. They soared over a rusting deck grate that was home to a small school of squid that drifted in and out of the parallel rows of square openings. Pitt guessed that it had simply been dumped by dockyard workers sometime in the past. He stopped the thrusters and settled the craft into the soft bottom beneath the liner's stern. A small cloud of silt filtered up and outward like a brown vapor, momentarily obscuring any view through the forward canopy.

Overhead, t ic hull of the United States stretched above them into the dusky water like a dark, ominous shroud. There was a sense of loneliness on the desolate bottom. The real world above did not exist.

"I think it best if we took a few minutes and thought this thing out," said Pitt.

"Don't ask me why," said Giordino, "but a dumb joke from my childhood suddenly popped into my head."

"What joke is that?"

"The goldfish that blushed when it saw the Queen Mary's bottom."

Pitt made a sour face. "The simple things that come from simple minds. You should rot in purgatory for resurrecting that old turkey."

Giordino acted as if he didn't hear. "Not to change the titillating subject, but I wonder if these clowns thought of using eavesdropping sensors around the hull."

"Unless we bump into one dangling from the dock, we have no way of telling."

"Still pretty dark to make out any detail." "I'm thinking we can set our light beams on the low end and begin inspecting the keel. Our chances of being spotted that deep beneath the hull are unlikely."

"Then as the sun rises higher in the sky, we can work out and up toward the waterline."

Pitt nodded. "Hardly a brilliant plan, but it's the best I can come up with under the circumstances."

"Then we'd better get a move on," said Giordino, "if we don't want to suck our oxygen dry."

Pitt engaged the thrusters, and the submersible slowly rose from the silt until it was only four feet below the keel. He concentrated on keeping the Sea Dog II on an even plane, glancing every few seconds at his positioning monitor to guide him on a straight track while Giordino peered upward, his eyes searching for any irregularity that indicated an exit or entry hatch that had been riveted in the bottom of the hull, taping any suspicious piece or workmanship with the video camera. After a few minutes, Pitt found it more expedient to ignore the monitor and simply follow the horizontal seams between the hull plates through the transparent canopy.