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In a new study scientists reveal up to 38-fold higher DMSP concentrations in Southern Ocean sea-ice versus the surrounding seawaters during the Southern Ocean austral winter. DMSP is known for protecting organisms against environmental stressors. Its degradation yields dimethylsulfide (DMS) and methanethiol (MeSH) which are important climate-cooling gases. The study underscores the role of this seemingly uninhabitable environment as a dynamic reservoir and transformation hub influencing climate-cooling cycles in the polar region.