In the Gulf of Mannar, where the Bay of Bengal meets India's southeastern coast, underwater gardeners are carefully transplanting coral fragments onto concrete frames, coaxing back to life ecosystems that have lost half their vitality since the 1950s. What was once a slow geological process—corals building their limestone skeletons over thousands of years—is now being accelerated by human hands, a necessary reversal of the damage caused by rising ocean temperatures, pollution, destructive fishing, and disease.

Coral reefs occupy less than 1% of the ocean floor, yet they shelter over 25% of all marine species, from seahorses to sea turtles to clams and sponges. These are the rainforests of the sea, and India is home to approximately 2,375 square kilometres of them spread across five major marine zones. The Andaman and Nicobar Islands hold the richest concentration with 1,021 square kilometres of coral cover, followed by Lakshadweep (934 sq km), Gulf of Kachchh (352 sq km), and Gulf of Mannar paired with Palk Bay (76 sq km). Recognizing their irreplaceable value, India grants corals the highest legal protection under Schedule I of the Wildlife Protection Act, 1972—a framework so strict that violators face three to seven years in prison.

The restoration itself is a labour of patience and precision. Teams grow coral fragments in land-based nurseries and underwater gardens, then transplant them back onto the seabed using adhesives like cement. The largest programme began in 2002 at Gulf of Mannar, led by the Suganthi Devadason Marine Research Institute. By 2024, the effort had expanded into adjacent Palk Bay. A parallel initiative, the Mithapur Coral Reef Recovery Project, exemplifies the scale of this work: it has installed 2,310 artificial reefs supported by 57 coral garden nurseries where corals are nurtured on rescued boulders before transfer to the artificial structures. Similar, smaller-scale programmes are now running in Lakshadweep, Gulf of Kachchh, and Andaman and Nicobar.

These restoration efforts matter because coral reefs provide far more than beauty. They sustain millions of coastal livelihoods, shelter fisheries that feed communities, protect shorelines from erosion and storms, and anchor tourism economies. The Gulf of Mannar Marine National Park, covering 560 square kilometres across 21 islands, is designated a 'no-go' and 'no take' zone for fishermen—a hard boundary protecting the recovery zone. The Coastal Regulation Zone Notification of 2019 extends protection further, banning development and waste disposal in these fragile ecosystems.

What makes India's approach distinctive is the integration of legal force with on-the-ground action. Protection alone is not enough when oceans continue to warm and acidify. Restoration is an active, human-led process aimed at rebuilding degraded reefs and enhancing their resilience to future stresses. The goals are ambitious: restore biodiversity, protect coral genetic diversity, and sustain the ecosystem services that millions depend on. It is slow work, measured in transplanted fragments and nursery generations rather than hectares reclaimed. But across India's five major coral zones, the work continues—a quiet, determined effort to turn back the clock on half a century of decline.