An undersea volcano eruption in Papua New Guinea’s Bismarck Sea is prompting tsunami concerns and other hazards, according to local authorities. Officials warn that the eruption is producing ash and smoke, and that pumice may fall in affected areas. They also caution that sea conditions can change quickly, citing unpredictable swells and turbulent currents. While the extent of any tsunami impact is not specified in the reports, authorities urge preparedness given the potential for wave activity linked to volcanic activity under the ocean. The warnings focus on short-term risks to people near coastlines and those monitoring local sea conditions. The available reporting describes the eruption as ongoing and emphasizes uncertainty around how the ocean may behave as the event continues. No details are provided in the excerpts about casualties or damage. The alerts highlight the need for public awareness of falling pumice, ash exposure, and dangerous marine conditions while officials assess the situation.