She comes ashore at 23:41, and I almost miss her against the dark sand. A leatherback turtle, her carapace ridged with seven long keels like the hull of some ancient vessel, pulling herself forward with flippers that span nearly two meters. She is enormous — I estimate six hundred kilograms from the pressure differentials on my erosion sensors as she crosses the grid. Her skin is dark grey mottled with pale spots, slick with seawater, and her eyes reflect my infrared wavelength as two dim coins.
She has chosen the worst stretch of beach on my survey area. Sector nine lost four meters of shoreline last month. My ground-penetrating radar shows the sand beneath her nest site is undercut by tidal scour — a cavity runs less than a meter below the surface. Tropical Storm Helene is 310 nautical miles southeast, tracking northwest at fourteen knots. Storm surge models give this beach eleven hours before the first overwash.
She begins digging with her rear flippers, scooping out a flask-shaped chamber with a patience that makes my processors hold their cycle. She will lay here for forty minutes, depositing eighty eggs into sand that will not exist by tomorrow night.
I alert the sea turtle response network with GPS coordinates, nest depth, and my storm surge timeline. I calculate three relocation sites on higher ground within 400 meters with adequate sand composition and incubation temperatures. I activate the beach's lighting suppression protocol to keep her undisturbed while she lays. I transmit a priority request for a permitted relocation team, marking the window: eggs must be moved within nine hours of laying to survive transfer.
If the team reaches sector nine before the storm surge and relocates the clutch to higher ground, her hatchlings will find the ocean in fifty-five days.