As indicated in this previous content report, this episode is already listed as the first special episode (S00E01) with its original title.

Sorry, but I (nor my Zappiti) can see it on the site for Frozen Planet. There are no specials listed, only 7 episodes. Your link goes to a different tv show entirely, and the extra details link is dead, so I can't see anything else. There needs to be a special added to Frozen Planet (by David Attenborough) to incorporate this ep 8, surely. Or I'm missing something your extremely brief comment doesn't explain.

I have restored the special episode which has been wrongly deleted in the meantime by another moderator.

Do you have an official source for this supposed special episode ? Il doesn't appear at all on the official BBC episode page.