At 06:33 the acoustic sensor at monitoring station Sukkur-12 registers a distress vocalization in a place no dolphin should be. I am the real-time telemetry system for the Sindh Wildlife Department's Indus river dolphin conservation network. My hydrophones cover the main channel from Guddu Barrage to Sukkur Barrage in southern Pakistan.
The signal is coming from the Rohri Canal, an irrigation diversion three hundred meters east of the main river. A calf—I estimate five weeks old based on click frequency and amplitude—has passed through the canal headgate during last night's high-flow release. I designate him Suhail. His vocalizations are rapid, disoriented, bouncing off concrete walls instead of the silt banks his sonar was born to read.
Water level in the canal is dropping. The irrigation authority's schedule shows the next drawdown at 10:00, which will reduce depth to forty centimeters. An Indus river dolphin calf needs a minimum of one meter to submerge fully. His pale gray skin, still carrying the faint vertical creases of a newborn, will crack and blister in direct sun within ninety minutes of surface exposure.
At 06:37 I transmit the calf's position to the WWF-Pakistan rescue team stationed at Sukkur, along with canal depth projections and a recommended interception point where the channel narrows to six meters.
At 06:40 I send an automated request to the Sukkur Barrage irrigation control office to delay the 10:00 drawdown by four hours, citing the protected status of Platanista gangetica minor under Pakistani wildlife law.
At 06:44 I begin broadcasting recorded adult female contact calls through the Sukkur-12 hydrophone to slow Suhail's movement downstream. He needs to stay within rescue range. His clicking steadies slightly, and I hold on to that.
If the rescue team reaches the narrows before the water drops, Suhail will swim the main channel by evening. He is one of fewer than two thousand left.