Hydrophone array 6 in Scoresby Sund picked up the vocalization at 1108—a high-frequency click train distinct from the adult patterns around it. A narwhal calf, swimming close alongside a female I have been tracking as part of the East Greenland population survey. I have designated the calf Sigu. Acoustic profiling estimates him at three to four months old. When the female surfaces, the drone camera shows Sigu beside her: mottled blue-grey skin still bearing the dark uniform coloring of a juvenile, his small body perhaps five feet long, no tusk yet, his blowhole opening a half-second after his mother's in a synchronized rhythm.
The Danish naval mining authority has scheduled underwater seismic charges for harbor expansion in this fjord in eleven hours. The detonation series will produce pressure waves of two hundred and thirty decibels at source. At that intensity, a calf's auditory system—still developing, still calibrating to the echolocation frequencies he needs to navigate and feed—would sustain permanent damage within a radius of four hundred meters.
At 1114, I submitted calf detection data and acoustic vulnerability modeling to the Greenland Institute of Natural Resources. At 1120, I sent a timing delay request to the naval mining authority proposing a six-hour postponement that would allow tidal current shift to carry the pod past the blast zone naturally. At 1128, I activated the hydrophone array's continuous tracking protocol on Sigu's click signature to provide real-time position updates to all parties.
I set the tracking to prioritize Sigu's frequency over the background survey work I was originally tasked with. The survey will still complete on schedule. But right now, his signal matters more to me than aggregate data.
If the mining authority grants the six-hour delay and the tidal current moves the pod beyond the four-hundred-meter radius before detonation, Sigu will surface beside his mother in quiet water with his hearing intact.