Something appears to be making a mysterious "pinging" noise on the sea floor of the Canadian Arctic. Inuit hunters in a remote community in Nunavut first reported the sound—also described as a "hum" or "beep"—complaining that it was scaring away marine animals in an area usually flush with them, reports the CBC.

Local lawmakers took up the case as callers to a radio talk show reported hearing it, too. The Canadian military sought to solve the mystery on Tuesday when it sent an aircraft to investigate, per the Guardian.

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But "the air crew performed various multi-sensor searches in the area, including an acoustic search for 1.5 hours, without detecting any acoustic anomalies," a rep says.

The military plans no further investigation. While "we don't have a single clue" about the source of the noise, "we're still working on it," a member of the Nunavut Legislative Assembly said this week.

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He added that the noise is "emanating from the sea floor." One of the more plausible theories is that mining companies are performing sonar surveys of the sea floor.

However, a company that has performed surveys in the area says it has no equipment in the water; officials add that no permits have been issued for construction, blasting, or hydrography work.

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Greenpeace, meanwhile, has denied claims that it's purposefully broadcasting the noise to keep animals away from hunters. (Maybe it's the Alaska Ice Monster?)

This article originally appeared on Newser: There's a Mysterious Sound Coming From Canada's Arctic