Coral reefs in Africa, thought dead for 60 years, found to be teeming with life.

A coral reef off the coast of Benin, long believed dead for six decades, has been found alive and teeming with marine life, according to a recent scientific expedition. The reef, located in the Gulf of Guinea near Benin’s coastline, was rediscovered after being presumed extinct since the early 1960s. Researchers have confirmed its vitality through underwater surveys and mapping using advanced sonar technology, revealing a rich ecosystem previously unknown to science. The reef lies approximately 54 meters below sea level in the mesophotic zone, often referred to as the “twilight zone” due to the limited sunlight penetration. These deeper reefs are increasingly studied because they host species distinct from those found in shallower waters and can serve as refuges from warming surface temperatures. The discovery highlights the underexplored nature of West African coastal ecosystems and underscores the potential for similar hidden biodiversity elsewhere. The reef's history dates back to the early 1960s, when scientists conducting fishery research observed formations resembling coral structures at depths ranging from 52 to 56 meters. However, relying on rudimentary sonar equipment at the time, researchers concluded the formations were lifeless. For the next sixty years, no further investigation took place until a new expedition revisited the area. Oceanographer Gérard Zinzindohoué, lead author of the study published in Frontiers in Marine Science and affiliated with Benin’s Institute for Oceanographic and Fisheries Research, described the fieldwork as challenging. He noted technical difficulties and uncertainties during the survey, which ran from April to December 2025. Despite these challenges, the team used modern sonar technology to map the seabed and identified two areas with hard substrates stretching over seven kilometers. The real surprise came when remotely operated cameras and drones captured footage of a thriving coral reef. Zinzindohoué recalled the moment of discovery, describing feelings of excitement and disbelief. “We still remember those first images,” he said. “After thinking so much about this reef, we suddenly saw something real before us.” The reef primarily consists of soft corals resembling sea fans. Scientists documented at least six different types of these corals, along with two species of black corals, known for their longevity and complex habitats. Eight species of fish were also recorded feeding and sheltering among the corals, including the golden African tuna, soldierfish, Guinea grunt, and butterflyfish. Zinzindohoué emphasized that this discovery might not be unique. “It speaks more to how little we know about the coastal regions of West Africa and beyond,” he said. “If we managed to find this reef again after 60 years, how many others remain undocumented or simply forgotten?” Benin, known for its historical ties to the Voodoo religion, has largely remained unexplored in terms of its marine environments. This finding adds to the growing body of evidence suggesting that much of the world’s oceans remain poorly understood, particularly in regions with limited scientific investment. The study was conducted by a multidisciplinary team of researchers who combined sonar mapping with direct observation using submersible cameras and drones. Their findings challenge previous assumptions about the state of deep-sea ecosystems in the region and open new avenues for marine conservation efforts. Researchers plan to conduct further studies to assess the reef’s ecological significance and resilience to environmental changes. They hope to establish baseline data for future monitoring and protection initiatives. The discovery has already sparked interest within the scientific community and could influence regional policies aimed at preserving marine biodiversity.