Ukrainian marine experts have warned that the impact of conflict around the Black Sea will “linger for decades,” with one scientist saying it will take “at least fifty years” to rebuild the local dolphin population. Navy divers and researchers are documenting how Russia’s full-scale invasion, launched in February 2022, is reshaping the sea, from mine contamination and unexploded ordnance to pollution and the death of thousands of animals. Among those involved in the work is researcher Ivan Rusev, who says military sonar, explosions and contamination have severely disrupted marine life, particularly dolphins and porpoises. A 2023 study estimated that 37,500 to 48,000 marine mammals may have died in the Black Sea during the first three months of the invasion. In June reports documented another surge in strandings along Ukraine’s southern coast. “We estimate that it will take at least fifty years to rebuild the population that existed before the invasion,” Rusev told TVP World. “My biggest dream is to win this terrible war and to see rich biodiversity and many, many dolphins again.” Researchers are using various techniques to document the destruction of the environment, including observing satellite imagery to track pollution drifting toward shore. Those who go into the water have seen the impact for themselves. Ukrainian crews who patrol the coast in CB90 combat boats, intercepting drones and supporting security operations, are more than aware of the dangers that lie below the water’s surface. “The danger from mines and other explosive objects will linger for decades,” a Ukrainian navy diver who gave his name as Harry told TVP World. “Even fifty years may not be enough to clear the entire Black Sea.”