Read Chapter 25: Aftermath of the Fall

The water pressed against Élise’s eardrums as she swam, the spear gun still clenched in her fist, the unconscious diver drifting upward behind her in a cloud of bubbles. Her lungs burned. The watch—Marchand’s watch—was strapped tight to her wrist, its silver face catching the last of the dying floodlights above.

Lucas grabbed her arm, pointed downward. The reactor housing came into view, a massive concrete-and-titanium dome planted in the seabed like a tumor on the ancient city’s flank. The entrance hatch was sealed, red emergency lights blinking from the edges.

They reached the airlock. Élise spun the external wheel. It didn’t move.

Locked.

She pressed her helmet against the viewport, peering into the flooded chamber beyond. Three figures in pressure suits huddled near the inner door, their faces lit by the cold blue glow of readout panels. The researchers. Alive.

She pounded on the glass. One of them—a woman with cropped gray hair—looked up. Dr. Halvorsen. Her eyes widened behind the visor. She shouted something Élise couldn’t hear, pointed at a panel beside the inner door.

The override screen.

Lucas swam alongside her. His voice crackled through the comm. “It’s on internal lockdown, not external. The failsafe’s armed the whole sub-level. We need the code.”

Élise unclipped the waterproof comm unit from her belt. Sophie’s voice came through thin, distant, like she was speaking from the bottom of a well. “The outer lock has a manual bypass, but it’s keyed to a safe box on the reactor’s third service deck. You need the imprint.”

“What kind of imprint?”

“Biometric. Palm scan.” Sophie’s voice broke. “The only person authorized to open it was Dr. Keller.”

Élise’s stomach went cold. “Keller’s dead.”

Silence hummed across the line. The current pulled at her fins, tugging her toward the dark edge of the reactor dome. Overhead, faint flashes of orange light marked the burning Atalante.

“There has to be another way,” Élise said.

“There is.” Sophie’s voice dropped, barely above a whisper. “You can manually flood the cooling buffers. It’ll vent the air pockets throughout the city—the sealed chambers, the hypogeum, the public halls. Everything with a breathable atmosphere gets flooded when the pressure equalizes. That’ll cool the core fast enough to bypass the failsafe sequence.”

The words hung in the water between them.

Élise understood. The sunken city of Aegis was still half-air. Beneath the Mediterranean, thousands of years of careful preservation had sealed certain structures so completely that the air inside remained dry, breathable. The air pockets weren’t just survival bubbles for the research team—they were the lungs of the site. The reason the frescoes hadn’t dissolved. The reason the papyrus fragments in the library were still intact.

Vent them, and the water would rush in. The murals would bleed. The scrolls would pulp. The city would become a drowned museum, its treasures turned to silt.

“How long?” Lucas asked.

“From the second you open the vents, about eleven minutes before the city equalizes,” Sophie said. “The core will stabilize at safe levels, but the failsafe will disarm itself once the pressure differential drops below the threshold. You’ll have to open the vents from the external manifold.”

“Where’s the manifold?”

“Eastern quarter of the city. On the roof of the Library of Erebus.”

Élise pressed her palm flat against the cold metal of the airlock. Through the glass, Halvorsen was watching, her face pale. The other two—a younger man and woman Élise didn’t recognize—pressed close behind her.

“They’ll die if we don’t,” Lucas said quietly. “And if we surface without doing something, Lefèvre’s men will seal this site for good. Everything gets erased anyway. Maybe the life, too.”

Élise looked down at the watch on her wrist. The inscription Marchand had left. She still hadn’t read it. The letters felt raised beneath her thumb, patient, waiting.

Another tremor ran through the seabed. Sand drifted up from beneath her fins. Overhead, a second explosion muffled the water.

“Girard might be dead up there,” she said, her voice flat. “Sophie’s on a sinking ship. The three of them down there have less than a month if we do nothing. And if we vent the city, everything I’ve spent my life working toward—everything that was ever found of Aegis—turns to silt.”

Lucas floated in front of her, his face solemn. “I know what this city means to you.”

“It means nothing if we let them die,” Élise said.

She looked back at the researchers. Halvorsen had realized what they were considering. Her mouth moved against her visor—something quick and harsh into her own comm. Élise’s receiver crackled.

“—don’t do it,” Halvorsen’s voice came through, distorted. “The air pockets contain organic material we haven’t even sampled yet. There could be DNA sequences that predate—” The signal cut.

“Halvorsen?” Élise called.

Static.

“The lockdown’s jamming deeper signals,” Sophie said. “You’ve reached the extent of my reach. If you’re going to move, move now. I’m detecting three incoming divers from the northwest. Estimated four minutes out.”

Élise made the call.

“Sophie, guide us through the vents. Give me the relay points to the Library of Erebus.”

“Élise—” Sophie’s voice wobbled.

“Don’t talk second thoughts at me. We’re not letting them die. The city’s already lost. We save its people.”

Silence. Then Sophie’s voice returned, steadier. “Take the main corridor past the forum. You’ll reach a collapsed peristyle. The water’s clear enough in the roof gap. Keep left through the hypogeum. The library’s on the second terrace, east side of the archive mound.”

Lucas turned first. Élise followed, kicking hard toward the ruined columns that marked the city’s outer edge. The emergency floodlights of the reactor fell behind them, swallowed by the murk of the ancient streets.

The hypogeum was darker than the rest—a long processional hall lined with sphinxes worn smooth by millennia. Water had risen partway up their flanks, their faces frozen in that patient, unreadable smile. Lucas swam low, his light carving a narrow beam through the suspended silt.

Above them, stone ceilings gave way to an open shaft. Pale blue moonlight filtered down through the water. The Library of Erebus rose ahead like the rib cage of some enormous beast, its marble columns snapped and leaning, its roof half-collapsed into the sea.

The manifold would be on the roof. Élise surfaced briefly into a shallow air pocket beneath the library’s remaining portico. She tore off her mask, gasping.

The air smelled of old stone, salt, and something else—something faintly chemical, metallic. The sealed chamber had been humid and warm, like a greenhouse abandoned.

“I’m on the roof,” she said, spitting water. She scrambled across the marble tiles, Lucas right behind her, their boots slipping on green algae. The manifold was set into a recessed panel—a series of valves arranged in a mechanical spray, crusted with oxidation but intact.

Élise knelt. The valves were labeled in modern script. Numbers. Solvents. Air pressure lines.

“Sophie,” she said. “I’m here. Which one first?”

“Valve one, red handle. Turn it a quarter turn counterclockwise. Wait for the pressure to drop. Then valve four.”

Élise reached for the red handle. Her hand hovered over it.

From here, she could hear the city around her. The faint whisper of water moving through the flooded streets. The creak of stone settling. Aegis had waited thousands of years beneath the waves, preserved by a quirk of geology and luck. Everything that defined it—the people who had built it, the gods they had worshipped, the records they had kept—was sealed in these air pockets.

One turn of a valve, and that was gone.

“Élise,” Lucas said softly.

He didn’t offer advice. He just waited.

She saw Halvorsen’s face through the glass again. Gray hair. Deep lines around the eyes. The way she had pushed the younger researchers behind her, even in her final moments, even when she didn’t know if they would be saved.

Élise turned the valve.

A hiss filled the chamber—slow, deliberate, like the breath of something vast waking from sleep. The pressure readout on the wall shuddered downward. Somewhere beneath them, a distant gurgling began. The sound of air leaving spaces that had not been touched in four thousand years.

She felt it in her bones, in the soles of her feet. The city taking its first breath of water in millennia.

Valve four followed. Then valve seven. A daisy chain of metal and pressure wound through the library’s hidden systems, and as each valve opened, the hiss grew louder.

She worked methodically. Red. Yellow. Green. The sequence Sophie recited over the comm like a half-remembered lullaby.

When the last valve clicked open, Élise sat back on the rooftop. The air pocket around her collapsed without drama; water rose over her knees, then her waist. She let it take her, buoying her mask back over her face.

Below, through the flooded halls, she saw the reactor’s light flicker. Steady. Cool.

Inside the airlock, Halvorsen’s hand pressed against the glass.

Élise drifted, watching the water rise past the library’s broken roof. The last of the air escaped in a gilded bubble, shimmering in her lamp’s beam as it rose toward the surface—far above the drowned city, past the burning Atalante, past the figure of Girard holding fast to his wheel, up to a moonlit sky that had never heard of Aegis.

She floated there until her body was still.

The city was dead beneath her now, but at least it had not died alone.

Lucas tapped her shoulder. His voice was gentle. “We need to move.”

She nodded. Kicked once. Together, they swam up through the ruined library, leaving the manifold and the valves and the sealed world behind.