“To really know what the ocean is, you have to see it for yourself,” intones Pierce Brosnan at the beginning of Disney’s latest nature doc. Taking in the film’s light-dappled deep-sea footage may be the next best thing, even if the ex-Bond-sman’s ponderous narration hardly facilitates a closer understanding of the life aquatic. Still, the film’s rigorous commitment to probing the undersea kingdom’s oddities separates it from the usual tepid Discovery Channel fare, and those looking for marine exotica and savagery will thrill to a sea slug that shimmies like a flamenco dancer and an orgiastic feeding frenzy involving dolphins, sharks and a school of sardines.—Andrew Schenker
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