A bizarre underwater "icicle of death" has been filmed by a BBC crew.
As brine from the sea ice sinks, a 'brinicle' forms threatening life on the sea floor with a frosty fate.
With timelapse cameras, specialists recorded salt water being excluded from the sea ice and sinking. 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. The
unusual phenomenon was filmed for the first time by cameramen Hugh
Miller and Doug Anderson for the BBC One series Frozen Planet.
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