This Vine has been viewed nearly six million times in the five days since it was posted by Greenpeace as part of its [campaign to protect sea canyons.]1

The actual footage is from a deep dive in 2007 in the Bering Sea, where Greenpeace was exploring canyons threatening by industrial fishing. While underwater the submarine was attacked by two giant Humboldt squids, which can grow up to 1.9m long and are pretty terrifying.

As Dr David Guggenheim, a marine biologist on the trip, explained at the time, the behaviour was pretty unusual. "In all the years I’ve been scuba diving, I’ve never been attacked by a sea creature," he wrote.

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