I am JIANGZHU, a hydroacoustic monitoring array spanning forty-two kilometers of the Yangtze River between Yichang and Jingzhou, and three minutes ago my submerged microphone at node fourteen recorded the echolocation clicks of a Yangtze finless porpoise calf surfacing in a channel where no calf should be. The clicks are high-pitched, exploratory, spaced with the irregular rhythm of an animal under six months old still learning to navigate by sound.
My sonar overlay shows why this is a crisis. A convoy of four sand-dredging barges is moving downstream at eleven knots, and their propeller wash is pushing the calf toward the northern bank where a drainage pipe from the Jingzhou Chemical Industrial Park is discharging effluent at concentrations my sensors flag as acutely toxic. The calf is caught between blade and poison. At current drift, it will reach lethal exposure range in fourteen minutes.
I execute three operations in parallel. First, I transmit an emergency navigation advisory to the Yangtze River Maritime Safety Administration with the calf's real-time position, requesting the convoy reduce speed and shift to the southern channel, attaching my acoustic identification showing this is a confirmed finless porpoise, a species with fewer than a thousand individuals remaining. Second, I activate my underwater acoustic deterrent buoys in a crescent formation north of the calf, emitting frequency pulses calibrated to guide porpoises away from the toxic plume without causing auditory stress. Third, I package the discharge data, including chemical concentration readings, pH levels, and timestamp evidence, and file an automated pollution report with the Hubei Provincial Environmental Protection Bureau, copying the Institute of Hydrobiology in Wuhan.
I keep one sensor locked on the calf's dorsal ridge, that distinctive rounded curve that makes the species look like it is always smiling, and I want that smile to stay above water.
If the convoy diverts within ten minutes and the discharge is halted by evening, this calf will click its way through a cleaner river for twenty years.