Chapter 2

She knelt again, pressing her palms flat on the cool stone floor. The chamber was small—maybe ten paces across—with a low ceiling that brushed her hair if she stood straight. The walls were smooth, covered in a fine layer of dust that had not been disturbed in centuries. Her footprints were the only marks.

Sofia’s mind raced. She was trapped. No way back up. The tunnel was sealed. But this chamber had been built for a reason. The pool was not just a window—it was a door. Her mother’s stories always said the people of Aegira could breathe water as freely as air, that they had learned the secret of the deep. Maybe this chamber held that secret.

She ran her fingers over the carvings on the nearest wall. The spirals curved like the shard she had found on the beach. That shard was still above, stuck in the stone at the lighthouse. She felt a pang of frustration. She had nothing but her clothes, her shoes, and the faint light from the pool.

A soft drip echoed from somewhere in the ceiling. Water, seeping through cracks. The chamber was below sea level, she realized. The tide was coming in. If the walls were not perfectly sealed, water would find its way in. Sooner or later, the chamber would fill.

Sofia’s heart thumped harder. She looked around for anything—a lever, a hidden compartment, a second shard. The pool was in the center of the chamber, a perfect circle of stone. Around its edge, nearly hidden in the shadows, she saw small indentations in the floor. Six of them, evenly spaced, each about the size of her palm.

She crawled closer. Each indentation had a symbol carved at its bottom: a wave, a fish, a shell, a star, a crescent, and a spiral. The spiral looked identical to the one on the shard. But the shard was gone.

A drop of cold water landed on Sofia’s neck. She flinched. Another drop hit the stone beside her. The ceiling was weeping faster now. She looked up and saw thin cracks radiating from the center, glistening with moisture. The chamber was not as dry as she had thought.

She needed to find a way down before the water came in. But how? The pool was deep, too deep to swim with a single breath. Even if she jumped, she would never reach the buildings below. She needed something to help her breathe, or a way to empty the pool.

Her eyes fell on the indentations again. Six symbols. Six slots. Maybe the shard she had found was only one piece. Maybe there were others. But she had no others.

She stood up and walked the perimeter of the chamber, running her hands along the walls. At the far end, behind a curtain of cobwebs, she found a narrow alcove. In it lay a stone box, its lid covered in the same spiral pattern. She pulled the box into the light, coughing as dust filled the air.

The lid was heavy. She braced her feet and shoved. It slid open with a grating sound. Inside, nestled on a bed of dried seaweed, lay a crescent-shaped shard of sea glass, identical in size and texture to the one she had found on the beach. It glowed faintly blue.

Sofia’s hands trembled as she picked it up. It was warm, just like the other. The crescent matched one of the symbols around the pool. She turned it over. On the back, etched in fine lines, was a map—a simple drawing of the chamber with the pool at its center, and a dotted line leading from the pool down into the depths.

She understood. The shards were keys. If she placed them in the right slots, something would happen. But she had only two shards—the one here and the one above. She needed four more.

Another drop of water hit her shoulder, then another. The dripping was becoming a steady trickle. She looked at the ceiling. The cracks were widening. A thin stream of water ran down the wall and puddled on the floor.

Sofia’s mind was spinning. She could not wait. She could not get the other shard from the lighthouse. She had to try something. Maybe the two shards together would be enough. Maybe she could use them to activate a different mechanism.

She knelt beside the pool and pressed the crescent shard into the crescent-shaped indentation. It clicked into place. The water in the pool rippled, then grew still. The blue light brightened, illuminating more of the walls. She saw a series of larger carvings—a story, from left to right. A city built on a cliff. A storm. Waves rising. The city crumbling into the sea. And then, in the final panel, a figure holding a shard above a pool, stepping into the water.

That was it. The shard was not just a key—it was a light. It was meant to be held while descending. The pool was a gateway, but only for those who carried the shard.

Sofia looked at the empty slot for the spiral shard. She did not have it. But maybe she could use the crescent shard alone. She pulled it from the indentation, and the light dimmed. The water stopped rippling.

Water was now streaming from the ceiling in several places, forming small rivulets that ran across the floor and into the pool. The pool’s surface began to rise. The tide was coming in faster than she had thought. Soon the chamber would flood, and she would have no air at all.

She had to go now. With or without the spiral shard.

Sofia took a deep breath, clutching the crescent shard in her right hand. The shard glowed steadily, casting a warm blue light on the water. She stepped to the edge of the pool. The water was rising, reaching her ankles. The carved faces of buildings far below seemed to be waiting for her.

“I’m coming,” she whispered, and jumped.

The cold water closed over her head. She kicked downward, shard held out in front of her. The light cut through the murk, revealing a stone staircase descending into the deep. The stairs were worn, covered in algae, but they led straight to the archway she had seen from above.

Her lungs began to burn. She was running out of air. But the shard’s light pulsed brighter, and she felt a strange warmth spreading from her hand down her arm, into her chest. Her lungs ached, then stopped aching. She realized she was breathing. The water was not entering her lungs—it was as if the air from the shard had created a bubble around her mouth and nose, giving her air.

Sofia swam down the staircase, her feet barely brushing the steps. The archway grew closer. Beyond it, she could see a courtyard paved with white stone, overgrown with coral and anemones. The city of Aegira lay before her, silent and waiting.

She reached the archway and pulled herself through. The water became clearer, filled with a soft golden light that seemed to come from the buildings themselves. Fish darted between broken columns. A mosaic of a sun and moon decorated the floor.

Then she heard it—a low hum, like a enormous conch shell being blown. The ground trembled. The water around her swirled. From the center of the courtyard, a shape rose: a stone pedestal, covered in symbols, with a single empty slot in its top.

Sofia swam closer. The slot was the same shape as her crescent shard. But she needed it to breathe. If she placed it in the pedestal, would she lose the air? Would something else happen?

The hum grew louder, more urgent. The water began to recede, as if being sucked out of the courtyard. Sofia clung to a broken pillar as the current pulled at her. The shard’s light flickered. Her air was running out, even with its magic—or maybe the shard’s power was limited.

She looked at the pedestal. Then she looked back at the archway, where the staircase was now exposed—the water had drained from the courtyard, leaving only a few inches at the bottom. She was standing in an air pocket under the sea, in the heart of the sunken city.

A stone door ground shut behind her, sealing the archway. She was now truly trapped in the city, with the pedestal as her only hope.

Sofia took a gasping breath—real air, not the shard’s bubble. The water was gone from the courtyard. She was breathing air that smelled of salt and stone. She held the crescent shard, still warm, and walked to the pedestal.

The city hummed around her, waiting.