what is it in the cave?
what is the skelleton in the cave?
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As far as I know it's based on an actual place in New Zealand which is (apologies if I get any of this wrong) sacred to the Maori people and contains a prehistoric whale skeleton. The real location was understandably too sensitive to film in and so a replica set was constructed for the cave interior.
http://www.youtube.com/watch?v=IT8jZk8AWHc