Cyanide fishing and rising water temperatures had decimated corals off Bali until a diver inspired by a German scientist’s pioneering work on organic architecture helped develop a project now replicated worldwide.
Based on “Biorock” technology, it is implemented in 20 countries, mainly in Southeast Asia, the Caribbean, Indian Ocean and Pacific.
In the turquoise waters of Pemuteran off the north coast of Bali, where the project was launched in 2000, a metal frame known as “the crab” is covered with huge corals in shimmering colors where hundreds of fish have made their homes.
“It’s amazing, isn’t it?” Rani Morrow-Wuigk says proudly.
The 60-year-old German-born Australian first dived in Pemuteran Bay in 1992, to see its beautiful reefs.
However, at the end of the 1990s, rising water temperatures had led to the near-disappearance of the reef, already badly affected by cyanide and dynamite fishing in the area.
“I was devastated. Basically, all the corals were dead. It was gravel and sand,” Morrow-Wuigk said.
However, when German architect and marine scientist Wolf Hilbertz told her about a discovery he had made in the 1970s, the diver’s ears pricked up.
Hilbertz had sought to “grow” construction materials in the sea, and had done so by submerging a metallic structure and connecting it to an electric current with a weak and thus harmless voltage.
The ensuing electrolysis had provoked a build-up of limestone, in a kind of spontaneous building work.
When he tested out his invention in Louisiana in the US, Hilbertz saw that after a few months, oysters progressively covered the whole structure and colonized the collected limestone.
More experiments were carried out and the same phenomenon was confirmed for corals.
“Corals grow two to six times faster. We are able to grow back reefs in a few years,” Jamaican marine biologist and biogeochemist Thomas Goreau said.
Goreau began working with Hilbertz in the mid-1980s to develop Biorock technology, and he has continued their work since Hilbertz’s death four years ago.
When Morrow-Wuigk saw the discovery, it gave her an idea for how she might save “her” bay.
She decided to expand the project to 22 structures using her own money with the help of Taman Sari, the holiday resort in front of the coral restoration project.
Today there are about sixty of these “cages” in Pemuteran Bay, across a surface of two hectares, and the reef has not only been saved from near-death, it is flourishing better than ever before.
“Now we’ve got a better coral garden than we used to have,” -Morrow-Wuigk said.
Biorock not only revives the corals, but it makes them more resistant, especially against bleaching and global warming.
“Biorock is the only method known that protects corals from dying from high temperatures. We get from 16 to 50 times higher -survival of corals from severe bleaching,” Goreau said.
The evidence of this has been on show in Pemuteran, Morrow-Wuigk said.
“We had coral bleaching happening in the last two years. The water temperature was 34oC, instead of 30oC. Only 10 percent of the corals were affected and 2 percent died. Whereas, in 1998, they basically all died,” Morrow-Wuigk said.
The local community in Pemuteran has also been won over after early reticence on the merits of the project.
“At first, I thought he was a crazy bule [“white guy”] putting iron in the water,” Komang Astika said, recalling his first meeting with Goreau, but in 2000, Komang joined the project when he left college.