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NewsBlue Planet II: Filming the rarely witnessed 'boiling sea'Episode four of BBC's Blue Planet II captures the rarely witnessed '˜boiling sea'; a feeding frenzy of thousands of tuna leaping out of the water to catch their prey.By The NewsroomPublished 19th Nov 2017, 14:17 BSTUpdated 12th Dec 2017, 03:30 BST Blue PlanetBBC/PA VideoRelated topics:BBC