Creatures of the Underwater Caves

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Blue Holes

New Species
By around 7,000 years ago, the polar ice caps melted to about their modern-day size and the sea level rose accordingly, flooding the blue hole caves in the Bahamas and elsewhere with saltwater. Marine biologist Tom Iliffe is pictured here with a new species of invertebrate. Most of the species discovered in the deep, oxygen-depleted marine waters are new to science, so we know relatively little about them.

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