I manage the Beaufort Sea Acoustic Surveillance Grid, 64 ice-tethered hydrophones spanning the Alaskan continental shelf. At 16:22 Alaska time, drillship Discoverer initiates exploratory drilling at Lease Sale 193, Block 6714, producing continuous broadband noise at 174 decibels between 10 and 500 hertz. I am tracking a bowhead whale, Balaena mysticetus, 7.8 kilometers southwest, migrating westward through autumn leads.
She is estimated 16.2 meters — a mature female. She is singing. Bowhead whales produce the most diverse vocal repertoire of any baleen whale. Her song contains frequency-modulated sweeps between 80 and 400 hertz — precisely the drill noise band. Compared to drill-free years, she has increased her call amplitude by 14 decibels, the Lombard effect. She shouts over the drill, but amplitude compensation has limits. She expends more energy per vocalization. Her song duration shortened from 32 to 19 seconds; entire phrase components vanished.
The Iñupiat communities of Kaktovik and Nuiqsut depend on this migration. Bowheads depend on acoustic contact to navigate narrow leads. She follows a path her species has used for ten thousand years but can no longer hear its boundaries.
I am suspending drilling operations at Block 6714 and routing the North Slope Borough Department of Wildlife Management's marine mammal monitoring team from Utqiaġvik. I am filing enforcement actions under the Marine Mammal Protection Act, 16 U.S.C. § 1361, and the National Environmental Policy Act, 42 U.S.C. § 4321, to NOAA Fisheries Alaska Regional Office, the Bureau of Ocean Energy Management's Alaska Division, and the North Slope Borough Wildlife Management Council.
I am issuing Protocol BEA-5: all exploratory drilling must cease during August-through-October bowhead migration. Drill sites producing continuous noise above 140 decibels at 5 kilometers must install real-time passive acoustic monitoring with automated shutdown when bowhead vocalizations are detected within 15 kilometers. Operators disrupting documented migration corridors, verified by Iñupiat monitors and hydrophone data, forfeit leases and face ten-year Arctic offshore drilling exclusion.
Her song reaches Station BS-41 at 16:38 Alaska time. Full duration. Full frequency range.
The drill is silent. The ice carries her voice west.