BBC: Frozen Planet, 'Brinicle' ice finger of death from Dan Droopy on Vimeo.
BBC Nature answers the obvious question: "What the...?"
The temperature of this sinking brine, which was well below 0C, caused the water to freeze in an icy sheath around it. Where the so-called "brinicle" met the sea bed, a web of ice formed that froze everything it touched, including sea urchins and starfish.
