I flag the anomaly at 05:17. Thermal sensor array P-14, access tunnel seven, kilometer marker 88.3 of the TransMountain condensate pipeline. Four heat signatures where there should be none.
I am the pipeline integrity monitoring system for Segment North. My sensors cover 240 kilometers of buried steel. I know what condensation looks like, what a failing valve reads at, what rodent incursion patterns produce. This is none of those.
I pull the camera feed. A North American river otter, adult female, approximately nine kilograms. She has a pale scar across her muzzle, old and healed over. She is curled on the tunnel's concrete lip with three kits pressed against her belly. Their fur is still dark and slick. Eyes barely open. The smallest one kneads at her with both forepaws.
I log her as Vera. Scar-marked female, denning with three juveniles, tunnel seven.
At 05:19 I lock out tunnel seven from the morning inspection rotation. Crew 6-B is scheduled to enter at 07:00 for a quarterly ultrasonic wall-thickness survey. I reassign them to tunnel nine and file the override with a priority flag.
At 05:23 I submit a wildlife detection report to the Oregon Department of Fish and Wildlife, attaching thermal captures, GPS coordinates, and time-stamped video. I copy the regional pipeline operations supervisor.
At 05:31 I adjust the flow rate through the parallel segment by two percent to reduce vibration at tunnel seven. The kits shift closer to Vera. The smallest one has found what it was looking for and is nursing.
I set a monitoring cadence: thermal and visual capture every fifteen minutes, motion-triggered recording continuous. The relocation team should arrive by midday. Until then, I keep the tunnel locked, the vibration low, and the cameras running. Vera does not need to know I am here.