The morning of December 26, 2004, dawned unremarkably along the Indian coastlines, promising a peaceful Sunday after Christmas. But by mid-morning, the calm gave way to chaos — a wall of water, inconceivably vast, surged toward the Indian Ocean shores, obliterating life and land alike.
The trigger was a magnitude 9.1 earthquake — one of the largest ever recorded — that ruptured 800 miles (1,300 kilometers) of the ocean floor. The tremors, deep in the Sunda Trench, sent shockwaves across 14 countries, including Indonesia, Sri Lanka, India, and Thailand. Within hours, the tsunami became one of the deadliest natural disasters in history, claiming over 2,27,000 lives and leaving a path of destruction in its wake. Survivors, dazed and shattered, scrambled through the wreckage in search of their loved ones, struggling to comprehend the scale of the disaster.
In Pallamthurai, Kanniyakumari district, Dr Vareethiah Konstantine, 65, an environmentalist and retired professor of animal sciences, was at home with his family when the news broke. “By mid-morning, the news of a calamity had spread, but its scale was incomprehensible. Reports of devastation poured in from places such as Kil Manakkudy, Kottilpadu, and Colachel.”
For Konstantine, the immediate concern was his parents, who were attending a family event in Vaniyakudy, a coastal town near Colachel. Communication was cut off and panic mounted. “The next day, I rode to Vaniyakudy on my two-wheeler,” he says. “My 82-year-old mother had a narrow escape. She was miraculously sheltered by a wall when the waters surged. A relative visited the district headquarters hospital mortuary to ensure my father was not among the dead. Thankfully, he was safe too.”
A sea of loss
For fishing communities, the sea was both a provider and protector, until it turned into a force of destruction. Beschi Antony Rayan, a fisherman from Kil Manakkudy, recalls: “It was like a wall of water moving towards the shore. It thrashed away the giant blocks of the highway bridge. When the water receded, it brought back to the sea all that was caught — men, women, children, and debris. Everything was over in five minutes.”
The Keechakupuram shipyard in Tamil Nadu after the tsunami. (Express Archives)
The aftermath was harrowing. Days passed before bodies could be found and buried, many found in the swamps and salt pans near the Pazhayar estuary and the Anantha Victoria Marthanda Varma Canal. The survivors fled their homes and sought refuge in nearby villages, where relief camps were set up.
The tsunami’s impact was as much economic as it was emotional. Entire villages were destroyed, homes washed away, and fishing gear swept out to sea. The community’s livelihood, once seen as low-risk, became a high-investment, high-risk business. “The sea, which had always been the fishing community’s provider, became a force of destruction,” says Konstantine, adding, “The mechanised boats that had begun to replace traditional wooden catamarans were pushed farther out to sea, and the costs of maintaining these boats skyrocketed.”
Rebuilding lives
As the waves receded, a new flood arrived – a deluge of aid from around the world. Governments, NGOs, and volunteers poured resources into affected areas. Yet, the goodwill often missed the mark. “It was like another tsunami. The aid kept coming, but the needs were more complex than what was being provided,” says Konstantine, who has documented 20 years of coastal change and fishing community life in his book ThuRaiyaadal (Dialogue with the Sea Coast). Relief agencies rushed to provide food, clothing, and medicine, but many overlooked the unique cultural and economic needs of fishing communities.
Survivors were relocated to distant areas and legal changes, including amendments to the Coastal Zone Regulation and the Fisheries Bill, meant that many lost their customary rights to coastal lands and livelihoods. “We spent more time protecting our rights than rebuilding our lives,” says Robert, a fisherman from Therespuram, Thoothukudi.
The psychological scars of the tsunami ran deep. A study by Kar, Krishnaraaj, and Rameshraj titled ‘Long-term mental health outcomes following the 2004 Asian tsunami disaster’ and published in the journal, Disaster Health, in 2013 found that six to nine months after the disaster, 27.2 per cent adults in Tamil Nadu experienced psychiatric disorders and 79.7 per cent reported psychological symptoms. Depression was the most common, with gender-specific patterns: men showing increased alcohol use and women experiencing heightened anxiety.
In Kanyakumari, 43 per cent men reported significant psychological distress, while in the Andaman and Nicobar Islands, 5–8 per cent of the population exhibited mental health issues. The trauma was not confined to India. Swiss tourists and survivors in Thailand’s Khao Lak reported post-traumatic stress disorder rates as high as 36.5 per cent years after the event.
The tsunami’s environmental toll was vast. In Indonesia, 90 per cent of mangrove forests were damaged, compromising coastal protection. Coral reefs in Indonesia, Thailand, and Sri Lanka were smothered by silt and debris. Freshwater sources were also contaminated and 62,000 wells in Sri Lanka were rendered unusable by seawater intrusion, according to a 2015 study The Indian Ocean Tsunami and its Environmental Impacts by Hari Srinivas.
In the Andaman and Nicobar Islands, seismic shifts caused coastal uplift and subsidence, altering tidal regimes and further stressing mangrove ecosystems. Agricultural land in Indonesia’s Aceh province suffered salinity damage, with 20 per cent of affected farmland deemed permanently unfit for cultivation.
What has changed 20 years on
This cataclysm was not without precedent. The Indian Ocean has experienced tsunamis before, though none on this scale. However, the lack of systematic documentation or disaster preparedness plans meant coastal communities were left vulnerable to the 2004 calamity.
While the devastation was profound, it also sparked an urgent reevaluation of disaster preparedness. Dr TM Balakrishnan Nair, Group Director & Scientist at the Indian National Centre for Ocean Information Services (INCOIS), says the event led to a major shift in how India, and the wider Indian Ocean region, prepared for tsunamis.
“The Indian government responded decisively, placing responsibility for developing a Tsunami Early Warning System with the Ministry of Earth Sciences (MoES),” Dr Nair says. “INCOIS took the lead in establishing the system, which was designed to detect tsunamis generated by earthquakes in regions such as the Andaman-Nicobar-Sumatra Arc and the Makran subduction zone.”
Ardito Kodijat, head of UNESCO’s Indian Ocean Tsunami Information Centre, has witnessed a seismic shift in global tsunami preparedness since 2004. Back then, there was just one warning system: the Pacific Tsunami Warning System in Hawaii.
“When the Indian Ocean tsunami struck in 2004, the Pacific system detected it and tried to send a warning. But it couldn’t do so effectively because the tsunami was in the Indian Ocean,” Kodijat says. By 2005, the Intergovernmental Oceanographic Commission of UNESCO had been tasked with coordinating a worldwide tsunami mitigation strategy. Central to this effort was the creation of the Indian Ocean Tsunami Warning and Mitigation System (IOTWMS), a network of organisations designed to monitor and alert countries at risk. Today, India, Indonesia, and Australia serve as the nerve centers for tsunami warnings across 26 nations in the Indian Ocean.
“We’ve gone from one warning system to four regional systems worldwide. Supported by 14 tsunami service providers, these systems can now issue warnings in as little as six to ten minutes,” says Kodijat.
The 2024 tsunami claimed over 2,27,000 lives. (Express Archives)
The Indian Tsunami Early Warning System (ITEWS) became operational in 2007, with a network of seismic stations, tide gauges, and tsunami buoys that monitor the Indian Ocean for any signs of a tsunamigenic earthquake.
Dr Nair says, “Our system can detect earthquakes within 10 minutes and issue tsunami advisories to authorities through SMS, email, fax, and a dedicated website.”
“Disasters we cannot prevent, but their impacts can be minimised through timely warnings and public education,” Dr Nair says. As part of this initiative, INCOIS worked with local governments and communities to recognise and prepare villages as ‘Tsunami Ready’.
“In 2020, Venkatraipur and Noliasahi in Odisha became the first communities in the Indian Ocean region to be recognised by UNESCO-IOC as Tsunami Ready,” Dr Nair recalls. This initiative has expanded, with 24 new coastal villages in Odisha recently achieving Tsunami Ready status.
“Once a community is prepared for a tsunami, they are better equipped for any coastal hazard,” Dr Nair says, adding, “We are now working with all coastal states and union territories in India to implement this programme.”
The development of new technologies has been central to the improvements in tsunami monitoring and response. ITEWS employs cutting-edge geospatial and IT tools, including seismic stations, tide gauges, and tsunami buoys, which provide real-time data to the early warning center. “Our system uses numerical modeling to simulate tsunami scenarios and predict travel times and wave heights,” Dr Nair said.
Looking Ahead
Reflecting on the 20th anniversary of the 2004 tsunami, Dr Nair says, “The tsunami taught us hard lessons about the fragility of coastal communities and the need for better preparedness. We have made significant strides since then, but there is always more to be done.”
For those like Konstantine, who witnessed the destruction and loss of life, the journey of recovery continues. “The tsunami changed everything,” he says. “But we are learning to rebuild, not just our homes, but our communities, our livelihoods, and our futures.”
The tsunami became one of the deadliest natural disasters in history. (Illustration: Abhishek Mitra) 
The Keechakupuram shipyard in Tamil Nadu after the tsunami. (Express Archives)
The 2024 tsunami claimed over 2,27,000 lives. (Express Archives)
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