Salt Seam

Each morning, Daya swam the length of the archive wall and pressed a thumb against every seam. The underwater district kept its seed library behind three layers of glass, and the new hydrogel made repairs possible without draining the room. Her checklist named the pressure, the salt, and the time each patch had been wet.

One section had begun to lift beside the old tide gate. Beyond it, a patch of living mussels filtered the channel; the station's safety plan called for sealing every leak before the next spring tide. Daya's brother wanted the gate closed, because the nursery behind it was the last place their family could grow food. The marine wardens wanted the opening kept wide enough for the shell beds to breathe.

Daya mixed the two gel components in a clear pouch and rolled the patch into a ribbon. It grabbed the glass as soon as she pressed it into place, stronger than the test coupons in her training module. A narrow gap remained where the water pushed through. She could fill it and keep the archive dry, or leave a breathing seam that would let the current carry the larvae in. She cut the ribbon in half. The first patch sealed; the second floated toward the mussels.