I found Wolf Hilbertz's technique for growing corals very interesting. A team of researchers on Vabbinfaru island in the Maldives submerged a huge steel cage called the Lotus on the sea floor. The 12-metre structure, which weighs 2 tonnes is connected to long cable which supplies a low-level electric current. The electricity triggers a chemical reaction, which leads to calcium carbonate coming out of solution in the water and being deposited on the structure. Corals seem to find that irresistible, perhaps because they use the same material to grow their protective skeletons, and the Lotus has been so thoroughly colonised by coral that it is difficult now to make out the steel shape beneath all the elaborate shapes and color. Really amazing!
Useful links:
www.wolfhilbertz.com
www.mrc.gov.mv
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