Icy Finger of Death: The Underwater Icicle

A brinicle, or brine icicle, plunges toward the seabed from the Antarctic ice shelf above, freezing marine invertebrates in its path and killing everything it touches. This had never been filmed before Frozen Planet.

The brinicle forms below sea ice when a flow of extremely cold, saline water is introduced to an area of ocean water, creating the underwater equivalent of an icicle.

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