The strung-up work lights ended at a turn, a deep, velvety blackness lying ahead. Vasiliy carried a million-candlepower spot lamp in his bag—a big yellow Garrity with a bullhorn grip—as well as two backup mini Maglites. But artificial light in a dark enclosure wiped out one’s night vision altogether, and for rat hunting he liked to stay dark and quiet. He pulled out a night-vision monocular instead, a handheld unit with a strap that attached nicely to his hard hat, coming down over his left eye. Closing his right eye turned the tunnel green. Rat vision, he called it, their beady eyes glowing in the scope.

Nothing. Despite all the evidence to the contrary, the rats were gone. Driven off.

That stumped him. It took a lot to displace rats. Even once you removed their food source, it could be weeks before seeing a change. Not days.

The tunnel was joined by older passages, Vasiliy coming across filth-covered rail tracks unused for many years. The quality of the ground soil had changed, and he could tell by its very texture that he had crossed over from “new” Manhattan—the landfill that had been brought in to build up Battery Park out of sludge—into “old” Manhattan, the original dry island bedrock.

He stopped at a junction to make certain he had his bearings. As he looked down the length of the crossing tunnel, he saw, in his rat vision, a pair of eyes. They glowed back at him like rat eyes, but bigger, and high off the ground.

The eyes were gone in a flash, turning out of sight.

“Hey?” yelled Vasiliy, his call echoing. “Hey up there!”

After a moment, a voice answered him, echoing back off the walls. “Who goes there?”

Vasiliy detected a note of fear in the voice. A flashlight appeared, its source down at the end of the tunnel, well beyond where Vasiliy had seen the eyes. He flipped up the monocular just in time, saving his retina. He identified himself, pulling out a little Maglite to shine back as a signal, then moved forward. At the point where he estimated seeing the eyes, the old access tunnel ran up alongside another tunnel track that appeared to be in use. The monocular showed him nothing, no glowing eyes, so he continued around the bend to the next junction.

He found three sandhogs there, in goggles and sticker-covered hard hats, wearing flannels, jeans, and boots. A sump pump was running, channeling out a leak. The halogen bulbs of their high-powered work-light tripods lit up the new tunnel like a space-creature movie. They stood close together, tense until they could fully see Vasiliy.

“Did I just see one of you back there?” he asked.

The three guys looked at one another. “What’d you see?”

“Thought I saw someone.” He pointed. “Cutting across the track.”