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At the depths narwhals hunt up to 1800 meters, or nearly 6,000 feet there isn’t any light, so sound is very important to them. They navigate by echolocation like bats, by emitting click sounds. From far away, the hammering of human activity may sound like a soft “puh,” like dropping a bag of grain, but to narwhals these sounds are the equivalent of being inside a loud, clanging bell; completely disorienting.

United statesSusanne ditlevsenSusannab blackwellUniversity of californiaUniversity of copenhagenWorld wildlife fundUniversity of copenhagen department mathematical sciencesExchange for local observationsImages groupGreeneridge sciences incGreenland institute of natural resourcesGreenland institute of natural resources pinngortitaleriffikDavid fleethamUniversal images groupWorld wildlifeLocal observations