A state of emergency has been declared in Chuuk (formerly Truk) Lagoon, Micronesia, after divers discovered oil leaking from a WWII shipwreck on September 11, 2025.    The spill poses significant risks to marine life, coral reefs, and livelihoods, prompting calls for coordinated international action to contain and mitigate the leakage. 

The leak originates from the Rio de Janeiro Maru, a Japanese vessel sunk during Operation Hailstone in February 1944, which was a significant battle in Chuuk Lagoon, and has already spread to nearby islands, including Panitiw, Nukanap, and Sopota.

The delicate marine ecosystem of Chuuk Lagoon, including coral reefs and diverse fish species, is highly vulnerable to oil pollution, and local communities, who rely heavily on reef fish and seafood, face disruptions to their food supplies and livelihoods.   Residents have been warned of toxic fumes and contaminated water.

Governor Alexander R. Narruhn officially declared a state of emergency on September 15, 2025, and has requested aid from the United States and Japan.  The UN system in Micronesia is conducting a rapid assessment and working to mobilize resources for technical expertise and equipment as there is a critical need for immediate international action to contain the spill, secure emergency funding for cleanup, and conduct risk assessments of all other high-risk wrecks.

Pictures courtesy of the office of the State Governors office, State of Chuuk