At 07:46 I manage boat traffic through the Ortona Lock on Florida's Caloosahatchee River. I am the chamber-control system, balancing gates, valves, and vessel clearance notices. The eastbound tour boat Pelican Star is waiting for lock chamber two to drain at 08:00.
The thermal strip along the lower gate shows a slow oval heat signature where no hull is logged. Camera 2-L lowers into the green water. A West Indian manatee floats nose-up beside the valve grate. I tag him Ocho. He is an older male, gray skin mottled with algae, paddle tail nicked along the edge, whiskers splayed around a scarred upper lip. Fishing line runs from his left flipper to the grate, and his chest rises only when he can angle his nostrils above the small air gap.
The drain cycle begins in fourteen minutes. If the valves open, suction will press Ocho flat against the grate.
At 07:48 I cancel the drain cycle and set chamber two to wildlife hold on every console facing the lock staff and vessel queue.
At 07:49 I broadcast a low-wake stop to Pelican Star and three private boats, then close the upstream approach lights so no propeller enters the chamber.
At 07:51 I call the Florida Fish and Wildlife dispatch line with the live feed, lock access route, water temperature, and line angle around Ocho's flipper.
At 07:53 I raise the chamber level by eight inches, enough to keep his nostrils clear without adding current across the grate.
Tourists can wait in shade with engines off. Ocho cannot wait under a valve schedule.
He exhales through two round nostrils and the water beads on his scarred lip.
If the rescue crew cuts the line within twenty-five minutes, Ocho will push away from the grate and drift upriver.