|Paula S. Apsell||Executive Producer|
|John B. Bredar||Producer|
|Howard Swartz||Executive Producer|
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Cast: James Barrat
Cave-diver Dr. Kenny Broad leads this release from the Nova collection, exploring "blue holes" - unique underwater caves created during the last ice age. Largely unexplored up until now, the formations represent a different geological world, thought by some to feel like an "alternate universe."
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