This is incredible! 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.

The weirdest part is when they speed up the movements of the starfish. They look like giant spiders!

'Frozen Planet' premieres Sunday, March 18, 2012 at 9PM on Discovery.

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