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10 of the world's most spectacular artificial reefs

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Reef balls

Many of the world's most spectacular artificial reefs are built from reef ball technology, deployed thanks to the Reef Ball Foundation. More than half a million reef balls have been placed on the ocean floor in more than 4,000 projects around the world.

The balls are specially designed to both protect natural reefs as well as provide habitat for new coral outcrops. Their design also provides fish protective alcoves, much as a natural reef would, and no toxic chemicals are used in their construction.