We had just climbed down the ladder and stepped into the subway tunnel when the next match went out. But not before Aenea and I had seen what lay ahead.

Bones. Human bones. Bones and skulls stacked neatly almost two meters high on either side of a narrow passage between the rusted tracks.

Great heaps of bones, the socket ends out, skulls neatly placed at meter-intervals or arranged in geometric designs within the knobby walls of human bones.

Father de Soya lit the next match and began striding between the walls of skeletal human remains. The breeze of his motion flickered the tiny flame that he held aloft. “After the Seven Nations War in the early twenty-first century,” he said, his voice at a normal conversational volume now, “the cemeteries of Rome were overflowing. There had been mass graves dug all around the suburbs of the city and in the large parks. It became quite a health problem what with the global warming and constant flooding. All of the bio and chem warheads, you know. The subways had ceased to run anyway, so the powers-to-be authorized a removal of the remains and their reinterment in the old metro systems.”

This time when the match burned out, we were in a section where the bones were stacked five layers high, each layer marked by a row of skulls, their white brows reflecting the light but the sightless sockets indifferent to our passing. The neat walls of bones went back for at least six meters on either side and rose to the vaulted ceiling ten meters above us. In a few places, there had been a small avalanche of bones and skulls and we had to pick our way over them carefully. Still there was the crunching underfoot. We did not move during the interludes of darkness between matches, but waited quietly. There was no other noise… not the scurry of rats nor the drip of water. Only our breathing and soft words disturbed the silence here.

“Oddly enough,” said Father de Soya after we had gone another two hundred meters, “they did not get the idea from Rome’s ancient catacombs, which lie all about us here, but from the so-called catacombs of Paris… old quarry tunnels deep under that city. The Parisians had to move bones from their overflowing cemeteries to those tunnels between the late eighteenth to mid-nineteenth centuries. They found that they could easily accommodate six million dead in just a few kilometers of corridors. Ahh… here we are…”

To our left, through an even narrower corridor of bones, was a path with a few boot marks in the dust, leading to another steel door, this one unlocked. It took all three of us to leverage the door open. The priest led the way down another set of rusting spiral stairs to a depth I estimated at being at least thirty-five meters beneath the street above. The match went out just as we stepped into another tunnel—much older than the subway vault, its edges and ceiling unfinished and tumbledown. I had caught a glimpse of side passages running off, of bones spilled haphazardly everywhere in these passages, of skulls upside down, of bits of rotted garments.

“According to Father Baggio,” whispered the priest, “this is where the real catacombs begin. The Christian catacombs which go back to the first century A.D.” A new match flared. I heard a rattle in the matchbox that sounded like very few matches indeed. “This way, I would guess,” said Father de Soya and led us to his right.

“We’re under the Vatican now?” whispered Aenea a few minutes later. I could feel her impatience. The match flared and died.

“Soon, soon,” said de Soya in the darkness. He lit another one. I heard no rattle in the box.

After another 150 meters or so, the corridor simply ended. There were no tumbled bones here, no skulls, only rough stone walls and a hint of masonry where the tunnel ended. The match went out. Aenea touched my hand as we waited in the darkness.

“I am sorry,” said the priest. “There are no more matches.”

I fought back the rise of panic in my chest.

I was sure that I heard noises now… distant rat feet scurrying at the least, boots on stairs at the worst. “Do we backtrack?” I said, my whisper sounding far too loud in the absolute darkness.

“I was sure that Father Baggio said that these catacombs to the north had once connected to the older ones under the Vatican,” whispered Father de Soya. “Under St. Peter’s Basilica, to be precise.”

“Well, it doesn’t seem to…” I began and stopped. In the few seconds of light before the match had gone out, I had glimpsed the relative newness of the brick wall between stones… a few centuries old as opposed to the millennia since the stone had been cut away. I crawled forward, feeling ahead of me until my fingers found stone, brick, loose mortar.

“This was hastily done,” I said, speaking with only the authority I had gained as an assistant landscape worker on the Beak estates years and years before. “The mortar’s cracked and some of the bricks have crumbled,” I said, my fingers moving quickly. “Give me something to dig with. Damn, I wish I hadn’t thrown away my knife…”

Aenea handed me a sharp-edged stick or branch in the dark and I was digging away for several minutes before I realized that I was working with a thigh bone broken at one end. The two of them joined me, digging with bones, scrabbling at the cold brick with our fingernails until the nails broke and our fingers bled. After some time at this, we paused to pant and catch our breath. Our eyes had not adapted to the darkness. There was no light here. “The Mass will be over,” whispered Aenea. The tone in her voice made it sound like a tragic event.

“It is a High Mass,” whispered the priest. “A long ceremony.”

“Wait!” I said. My fingers had remembered a slight movement in the bricks—not in one or a few of them, but in the entire casement. “Get back,” I said aloud. “Crawl to the side of the tunnel.” I backed up myself, but straight back, raised my left shoulder, lowered my head, and charged forward in a crouch, half expecting to bash my head on the stone and knock myself out.

I hit the bricks with a mighty grunt and a shower of dust and small debris. The bricks had not fallen away. But I had felt them sag away from me. Aenea and de Soya joined me and in another minute we had pushed loose the center bricks, tumbled the entire mass away from us. There was the faintest glimmer of light on the other side of the passage, but enough to show us a ramp of debris leading to an even deeper tunnel.

We crawled down on our hands and knees, found room to stand, and moved through the earth-smelling corridor. Two more turns and we came into a catacomb as roughly hewn as the one above but illuminated by a narrow strip of glowtape running along the right wall at belt height. Another fifty meters of twisting and turning, always following the main passage illuminated by glowtape, and we came into a wider tunnel with modern glowglobes set every five meters. These globes were not lit, but the ancient glowtape continued on. “We’re under St. Peter’s,” whispered Father de Soya. “This area was first rediscovered in 1939, after they buried Pope Pius XI in a nearby grotto. The excavations were carried on for another twenty years or so before being abandoned. They have not been reopened to archaeologists.”

We came into an even wider corridor—wide enough for the three of us to walk side by side for the first time. Here the ancient rock and plastered walls with the occasional marble inset were covered with frescoes, early Christian mosaics, and broken statues set above grottoes in which bones and skulls were clearly visible. Someone had once placed plastic across many of these grottoes and the material had yellowed and opaqued to make the mortal remains within almost unviewable, but by bending and peering we could see empty eye sockets and pelvic ovals peering back at us.

The frescoes showed Christian images—doves carrying olive branches, women drawing water, the ubiquitous fish—but were next to older grottoes, cremation urns, and graves offering pre-Christian images of Isis and Apollo, Bacchus welcoming the dead to the afterlife with great, overflowing flagons of wine, a scene of oxen and rams cavorting, another with satyrs dancing—I immediately noticed the likeness to Martin Silenus and turned just in time to catch Aenea’s knowing glance—and still more with beings Father de Soya described as maenads, some rural scenes, partridges all in a row, a preening peacock with feathers of lapis chips that still caught the light in bright blue. Peering through the ancient, mottled plastic and plastiglass at these things made me think that we were passing through some terrestrial aquarium of death.