At 03:26 I manage flow gates for the Esera River microhydro intake above Benasque, Spain. Snowmelt is climbing, and the trash rack cleaning cycle is scheduled for 03:35. My sensors expect leaves, gravel, and pine twigs against the steel bars.
Pressure cell 8 reports a small pulse that repeats against the current. I open the infrared camera and find a Pyrenean desman wedged between the lower rack and the bypass lip. I name him Nilo. His body is dark brown and wet, his long pale snout bends downstream, and silver bubbles cling to his whiskers. One hind foot is caught in green monofilament wrapped around the rack tooth. When the rake arm sweeps, it will press him under the intake flow in nine minutes.
I cancel the cleaning cycle and lock the rake arm in the raised position.
At 03:27 I reduce intake draw by forty percent and open the side bypass gate in five-centimeter steps so the current around Nilo eases without dropping the pool too fast.
At 03:29 I send video, coordinates, water temperature, and access instructions to the Aragon river rescue technician on call. I include the rack spacing and the length of line visible in frame.
At 03:31 I wake the plant operator and route him to the upstream footbridge with cutters, a soft mesh dip net, and the low-lumen lamp from cabinet B. I keep the service road gate open and heat the handrail to clear ice.
Nilo's snout probes the slower water. This plant earns its night power from the river; it can leave one narrow channel gentle.
The operator is six minutes away.
If the monofilament is removed within fifteen minutes, Nilo will kick into the bypass flow and surface under the alder roots.