Submarine high-intensity methane seeps have been surveyed in the Sorokin Trough and Paleo Dnepr Area in the Black Sea from May to June, 2003 to estimate the sea-air methane flux. The Sorokin Trough mud volcano area in around 2080 m water depth shows no direct effects on the methane concentration in the surface water and the atmosphere (average methane saturation ratios (SR) of 143%). The average sea-air methane flux can be determined as 0.2--0.57 nmol m-2 s-1, using two different sea-air gas exchange models; mean wind speed were extraordinary low throughout the cruise (1.16 m s-1). The investigations in the Paleo Dnepr Area (60 to 800 m water depth) reflects a more diverse pattern. Spots of high methane concentrations in the surface water have been recorded above a seep location in around 90 m water depth (SR up to 294%). The air-sea methane flux above this seep site (0.96--2.32 nmol m-2 s-1) is 3 times higher than calculated for the surrounding shelf (0.32--0.77 nmol m-2 s-1) and 5 times higher than assessed for open Black Sea waters (water depth > 200 m, 0.19--0.47 nmol m-2 s-1).