Still in the Tanninstained waters of the Sunken Valley the team explore in virtual darkness looking for the mysterious sea pens. Timelapse photography reveals the behaviour of these extraordinary creatures which anchor themselves to the seabed. Amazing clip taken from the BBC's Ocean series. Visit http://www.bbcearth.com for all the latest animal news and wildlife videos and watch more high quality videos on the new BBC Earth YouTube channel here: / bbcearth
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