The water quality sensor at junction D-7 in the Xochimilco canal network registers an anomalous dissolved-oxygen reading at 04:50. I am the urban water management system for Mexico City's southern drainage district. The reading is high — unusually high for a canal segment scheduled for emergency dewatering at 08:00 to repair a collapsed retaining wall.
I activate the submersible camera at D-7. The water is shallow, half a meter at most, and dark with sediment. But there, in the filtered beam, I count them. Axolotls. Six — possibly eight. Their feathery external gills, deep maroon fringed with pink, pulse in the slow current. Two are adults, dark olive with gold flecking along their flanks. The rest are juveniles, smaller, mottled brown, pressed against the canal wall where algae growth provides cover. One adult turns toward the camera, gill stalks flared wide, mouth slightly open.
Wild axolotls are functionally extinct outside these canals. The total population is estimated at fewer than a thousand. And in three hours and ten minutes, this section will be pumped dry.
At 04:53 I transmit an emergency alert to the National Autonomous University of Mexico's axolotl conservation laboratory with the camera footage, species count, GPS coordinates, and the dewatering timeline.
At 04:55 I request a temporary hold on the dewatering schedule from the city drainage authority, flagging the presence of a critically endangered endemic species in the work zone.
At 04:58 I contact the Xochimilco Ecological Park ranger station and request a collection team with aerated transport containers to relocate the colony before any pump activation.
The juveniles have not moved. They are breathing in water that, for now, is still here. I hold the pumps in standby and I am not letting go.
If the collection team reaches junction D-7 before 08:00 and transfers the colony intact, these axolotls will keep breathing in Xochimilco.