Sound did not carry well in near vacuum, but Dr. David Alexander felt the slight, ringing vibration of each step through the insulation of his Marsuit boots. There'd been no sound within this chamber inâ¦how long? The team's best guess was half a million years.

“Halfway across the catwalk,” he said, speaking into the needle mike positioned close by his lips. “Twenty meters.” Over the headset clamped down over his ears, he could hear the unsteady rasp of his own breathing, the
hiss-thump
of his backpack PLSS. His breath, hot and moist, fogged his helmet visor with each exhalation, a white smear immediately dissolved by the stream of cool air blowing past his face.

“
Ah, we copy that, Aladdin
,” a voice crackled in his ears. “
You're looking good
.”

Aladdin
. The radio handle was a last-minute joke concocted by Ed Pohl that morning, back at C-Prime. Naming this place the Cave of Wonders had been his idea, after he'd seen the first transmissions from the penetrator robot three days ago.

It could as easily have been Ali Baba. The cavern, apparently, required a human presence to operate it, a living
open, sesame
to switch on power and lights and to open doors. Robots massing one hundred kilos and programmed
to radiate at thirty-seven degreesâhuman body temperatureâhad failed to learn anything about the long-sealed chamber. Alexander, claiming the right as the one who'd found the cavern entrance in the first place, had volunteered to go in. He was, he estimated, a hundred meters into the vast and labyrinthine complex hollowed out beneath the Cydonian Face, and perhaps ten meters beneath the surface of the ground outside.

“
Aladdin, we're seeing an increase in heart rate and respiration. Please check your O
₂mix
.”

“Copy.” His eyes flicked to the med and PLSS readouts mirrored above and to the right of his visor, checking that all were well in the green. Of
course
his heart and breathing were faster, the idiots! “O-two at six-point-three. Systems nominal. Fifteen meters.”

“
Ah, roger that, Aladdin. Watch the hyperventilation
.”

That sounded like Doc Penkov. He could imagine all of the Team members back at Cydonia Prime, crowded into the radio shack as they followed his progress. Only Devora Druzhinova and Louis Vandemeer were on the surface today, now waiting just outside the tunnel entrance in case he needed help.

The catwalk of black metal trembled harder with his next few steps, and he stopped, gripping the pencil-thin guardrails to either side until the motion dampened itself out. His heart was pounding hard now, beneath the breastplate of his suit. At last, he was inside the Faceâ¦.

The Faceâ¦first observed on photographs transmitted to Earth late in the previous century by the Viking orbiters and subsequently confirmed by other robot spacecraft. The Faceâ¦enigma and lure, drawing scientists like David Alexander to probe its secrets, held in silence now for half a million years. Even now, with all the evidence of the ancient ruins uncovered on the Cydonian plain, with the uncanny discovery of flash-frozen and desiccated corpses of long-dead archaic
Homo sapiens
on Mars, there were some who yet thought the two-kilometer-long mesa's vague and sandblasted resemblance to a human face to be the product of chance and human psychology.

The discovery of the Cave of Wonders had all but put
to rest that notion. Sometime between four and five hundred thousand years ago, someone had reshaped a natural landform, giving it the vaguely apelike, vaguely human features that had attracted so much comment when they were first noticed sixty years before. At the same time, they'd hollowed out the Cave in the bedrock beneath the towering mesa, connecting it by a long, descending, and carefully sealed tunnel to the well-hidden entrance on the Face's eastern corner, just below the left end of the harsh-carved canyon slash that formed the Face's mouth.

Once, the Cave had been airtight, accessed through a series of airlocks that still worked at the touch of a gloved, human hand. But even solid rock is porous over geological time. The air within this enormous chamberâradar probings had established that it was a spherical cavern half a kilometer acrossâhad leaked out long ago. The air pressure inside now stood at a little below ten millibars, the temperature constant at minus fifteen degrees Celsius.

Alexander tried not to look down. The catwalk seemed impossibly frail, a spider's web of black, interlacing threads woven into a deck that felt solid and metallic enough but was hard to see against the deeper black of the two-hundred-meter depths below. Ahead, a pale lightâa white-yellow glow a meter across without visible sourceâilluminated the end of the catwalk; the only other light in the place came from the worklights mounted on the shoulders of his suit and from the telltales inside his helmet.

“Ten meters,” he said.

“
Hold it, Aladdin. Can you pan for us
?”

“Roger. Panning to the right.” Carefully, he turned himself in place, allowing the camera mounted on the outside of his helmet to relay the view across a full three-sixty. He could see nothing but black; the cavern swallowed his worklights in impenetrable darkness, but the camera would be picking up frequencies invisible to his eye. Perhaps they were enjoying a better view of things than he, back at the Team HQ.

Alexander thought of Howard Carter. On November 26, 1922, after a long dig and repeated disappointments, the British archeologist had chiseled a narrow hole through a
stone door separating him from another world, in a long-sealed tomb in Egypt's Valley of the Kings. Air thirty centuries old, hot and stale, had gusted from the opening; a candle thrust through the hole flickered but remained lit, proving the air breathable.

Carter's heart must have been pounding as hard as Alexander's was now, his breathing as fast and as uneven, as he carefully enlarged the hole and peered through. The candle's flame had been captured and flung back at him by myriad polished surfaces of pure gold.

“
Can you see anything?” Lord Carnarvon, his partner and the expedition's backer, has asked, close at his shoulder
.

“
Yes,” Carter had replied, his voice cracking with emotion. “Yes, wonderful things
!”

Alexander knew now exactly what Carter must have felt as he first addressed that sealed, stone door leading to the tomb of Tutankhamen.

“
Still not a lot to see
,” the voice said over his headset, “
even at IR freaks. Maybe this thing is a bust after all
.”

Alexander refused to even consider the possibility. “I'm moving again. Eight meters.”

It could not be a bust. It couldn't. So far, except for the automated controls on the airlock doors on the way in, there'd been no positive indication that there was anything inside this sealed, empty sphere worth exploring. Even so, Alexander had suggested the name Cave of Wonders in what was for him an atypically romantic whim; no one knew what they would find in the chamber, though speculation had ranged from living quarters for the transplanted humans who'd worked here, to some kind of operational center for the yet-unknown intelligences who'd brought early hominids to this place, to a starship, intact and filled with secrets buried these past five hundred millennia.

The last few steps toward the end of the catwalk, suspended high above an invisible floor and surrounded by darkness absolute, were the hardest steps David Alexander had ever taken. He was drawn on, however, by wonder
and by Howard Carter's ghost. Like Carter, he was standing at a doorway opening to another world.

But he still needed to find the keyâ¦.

“Five meters,” he said. “I'mâ¦I'm entering the lighted area now.” The sourceless glow seemed to hover above a widening in the walkway, a structure that reminded him, disconcertingly, of the harpoon gunner's bowsprit platform on an old-time whaling vessel.

Light surrounded him. He raised his gloved hands, staring at the white material. St. Elmo's fire danced from the fingertips, cold and otherworldly. His fingertips traced blue arcs in the airâ¦

â¦and the cavern was no longer shrouded in blackness. From his vantage point, suspended near the center of that kilometer-wide chamber, it seemed as though he was in the middle of a perfectly spherical swarm of stars, each star rigidly locked with the geometric perfection of the other stationary stars around it. There were thousands of them, in orderly, regimented splendor. Fainter glows floated among the ranked stars, forming oddly regular sweeps and streaks and dots that
might
have been words, an alien script felt more than seen.

“Ah, Control,” he called, his breathing coming faster still. “Are you picking this up?”

“
Roger that, Aladdin. We seeâ¦something, but we're not sure what we're seeing. What do you make of it
?”

“I'mâ¦notâ¦sureâ¦.”

As he focused on one section of that far-off wall of stars, one marked by one of the alien-script words, it seemed as though one section of the spherical surfaceâtwenty degrees, perhapsâbroke off and rushed toward him, each star becoming a tiny, polished facet, like a jewel.

Orâ¦like a display screen or monitor.

How was the illusion accomplished? Was he seeing something real? Or was it in his mind?

Alexander blinked, hard. Sweat was trickling down his face, tickling his nose and stinging his eyes, and he yearned to be able to reach up and wipe it away. His mouth felt as dry as the thin, dry vacuum of the Martian atmosphere. He was looking now at an array of tiny, rec
tangular TV screens, an array at least fifty rectangles wide and fifty highâ¦or were they, in fact, tiny? He had no way of judging scale. They might have been the size of a thumbnail, suspended a few centimeters in front of his eyes, or the size of a theater's holoscreen, each three stories tall. Without a frame of reference, there was no way to tell.

“
Aladdin! We're not seeing anything here. Can you describe what you're seeing
?”

The clear majority of those screens, he sawâperhaps two thousand of them or moreâwere blank. But on the othersâ¦

He picked out one that was alive with a reddish hue, straining to make out the scene he could just distinguish glowing in its depths. Abruptly, and silently, the screen expanded until it filled his field of vision.

“
Aladdin
!” the voice called, tinny in his ears. “
Aladdin! Can you see anything
?”

It took Alexander a long time to answer. “Yes,” he replied at last. “Wonderful things!â¦”

BOOK: Luna Marine

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