2/5 should have read the other reviews
  by Stewart Rudd (Orem, UT USA)
Some of the scene's were amazing, like the ice cave scene. The movie followed two girls doing research. I wanted more caves, and exploring them. This was pretty lame. The 2nd graders, made me think I was watching the magic school bus. If they would have shown more "AMAZING" caves then it would have been better.

3/5 i think i saw a cave!
  by bob (charlottesville VA)
most of this movie was a search for extremophiles
there were more flyby mountain scenes, kayaking scenes, scenes of second graders than actual scenes of caves
the cave diving segment was pretty cool; thats why i gave it 3 stars not 2
if want to see something with lots of insides of caves this is not for you

3/5 Caves and Neeson are not featured, but by-products
  by Renee Pearison (Virginia)
This is first and foremost a journey about two scientists looking for extremophiles. It just happens that where they are searching is in caves. The caves are spectacular, but since the focus is on the scientist you are left wanting more.

I was also disappointed in that it really wasn't narrated by Liam Neeson. He introduced the movie, but the majority was the scientist explaining what they were doing. When I read that the movie was "narrated" I was expecting something more along the lines of how David Attinborough narrates Planet Earth.

If you are looking for something more along the Planet Earth or the Scenic National Park Series, you may want to think twice about buying this DVD. This video was okay, but I don't know how many times I will re-watch this so I don't think I received full value for my money.