Thirteen Seconds Beneath the Ice
At Frostlamp Under-Ice Window, I shut down active scanning first. Below us, the sea butterflies folded their broad wing feet together and sank. The de-icing pulse had not arrived yet. Their line showed where it would cross. Fang kept her noninvasive BCI and sampler at a safe distance. I stood on the windward side with my weapon secured low.
Field Observation
Morning at Frostlamp Under-Ice Window: the sea butterflies furl before a de-icing pulse. Noon at Sail-Butterfly Brine-Light Trench: Fang compares their movement with algal light while I trace the heat path. Evening at No. 1 Sunken-Cable Trough: we stop the first mismatched connector and watch the animals reopen their sails beneath the ice.
Morning · Frostlamp Under-Ice Window
The sea butterflies moved close under the ice, feeding along the aurora-algal film. Their milky mantles carried a narrow orange-cyan gland. Then the band folded its two wing feet and descended as one. We stayed outside that line. The harbor alarm would follow thirteen seconds later. The animals had read a fault in the cable de-icer before the harbor could report it.
Noon · Sail-Butterfly Brine-Light Trench
Fang compared each closure of the wing feet with the changing brightness of the algal film. I used a passive heat meter to trace the pulse beyond the cable boundary. The harbor had restarted a fixed-frequency de-icer to reconnect its outlying research towers. It had flattened the rhythm that let living things read aurora current, brine openings, and the windbreak. We did not move the animals or run another pulse through them to confirm the path.
Evening · No. 1 Sunken-Cable Trough
We switched off only the first connector whose timing was wrong. The trough grew cold and dark again. One by one, the sea butterflies spread their wing feet and glided close beneath the ice. Fang kept measuring from a distance. I kept my weapon where it was and left the rest of the cable system untouched.
Habitat Causality
Aurora current, under-ice brine tide, and natural windbreaks sustain the Frostlamp–Sunken-Cable Rhythm. Fixed-frequency de-icing warmed the sunken cable and sent heat beyond its intended boundary, melting snow ridges early, blocking brine breathing openings, and destabilizing the windbreak. The sea butterflies’ coordinated descent appeared thirteen seconds before the harbor alarm. Passive measurements identified the first mismatched connector. Switching it off restored the trough’s cold darkness without using the animals as a test.
Species Behavior
These pteropod mollusks filter the aurora-algal film while gliding on two thin wing feet below the ice. Before the heat pulse arrives, the group furls and sinks together. When the water returns to its cold, dark state, they spread their wing feet and continue on their own.
「We changed the machine. We did not chase, aim at, or ask the sea butterflies to prove the repair for us. I recorded where their line returned to the ice and let them go.」
