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10 of the world's most spectacular artificial reefs

Obsborne Reef tires

Photo: U.S. Navy/Wiki Commons

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Osborne Reef

This artificial reef off the coast of Fort Lauderdale, Fla., is a glaring example of how artificial reefs are not always a good idea. They must be carefully planned and should not be an excuse to use our marine ecosystems as junkyards.

Constructed of millions of discarded tires, the reef failed after the tires became loosened and began colliding with nearby natural coral reefs, destroying them in the process. The project has come to be referred to as an environmental disaster. A large-scale clean-up is still being conducted by the U.S. military.