The idea of creating artificial reefs is a good one but not new in anyway. ver since the first passenger threw something overboard or the first vessel sank, man has been creating artificial reefs.
Here is a link to some of the information on Georgias Artificial Reef Program.
One thing that folk should remember is that while the base for a reef may well be artificial, the actual growth on the reef is entirely natural. The creatures that congregate, the things that grow on the reef are the same things one would find on a naturally occuring reef in the same location.
Some of the things we used over the years included NYC Subway cars, surplus Sherman Tanks, vessels, rubble from demolition of an old bridge as well as designed reef balls and cones. There was also an active program on design and effectiveness of various materials and arrangements.
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