Have you been diving around artificial coral reefs before? I personally love them a lot. Around such structures a lot of different marine life can be observed from the smallest critters, hiding away, to large fish assembling in schools around. And they often offer all that in areas where there wouldn't be as much to
The Pros and Cons of Being a Hammerhead Shark - The New York Times
Artificial Coral Reefs - Types, Reasons, Pros and Cons - More Fun
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Coral Reefs ~ MarineBio Conservation Society
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Climate change is hurting coral worldwide. But these reefs off the
Coral reef protection - Wikipedia