Video footage showing a mysterious object or creature moving back and forth just the below the surface of the Chena River in Alaska has gone viral, arousing speculation from hundreds of social media users (video below).
Craig McCaa of the Bureau of Land Management was taking photos of the river when he noticed a "strange thing" snaking through the water.
"It never fully revealed itself," he told ADN.
McCaa shot a 22-second video and uploaded it, complete with ominous music, to the Bureau of Land Management – Alaska Facebook page Oct. 26. The clip has since been viewed more than 354,000 times, with hundreds of people weighing in on what the "thing" might be.
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"I initially thought, and several people thought, it could be some rope that snagged on the bottom of the river with chunks of ice," McCaa said. "Other people have mentioned everything from sea monster to giant sturgeon."
He added that he was more fascinated than frightened by what he saw.
"It's a strange thing," he said. "I don't know what I would have done if I had come by in a canoe or something. But looking from above on the University Avenue Bridge I didn't feel too threatened."
While the Bureau of Land Management conceded that they were unable to identify the object, biologist Klaus Wuttig of the Alaska Department of Fish and Game offered his opinion on the matter.
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According to Wuttig, the video simply depicts a rope covered in ice.
"It looks like it's swimming but it's actually stationary and just wading in the current," he explained to ADN. "It looks like it's swimming upstream. But it's not organic."