Within the last decade a large dataset of high-resolution bathymetric and sidescan sonar data has been acquired for the deeper parts of the Black Sea. They show many manifestations of gas seepage that is accompanied in several cases by mud expulsion. The sidescan sonar data allow imaging the seafloor at metres scale resolution and the detail shown has modified our understanding of gas seepage in the Black Sea. Unexpectedly, the presence of gas bubbles in the water column has been detected even in great water depth, where gas hydrates should form. Some of these gas flares are intermittent at various timescales, as shown by pulses of high backscatter on sidescan sonar records. Sidescan sonar data show a variety of mound structures that are not related to mud volcanism, but are formed mainly by authigenic carbonate precipitation. Finally, several mud volcanoes have been mapped in the Sorokin Trough, where they show strong variations in morphology and backscatter distribution on even small lateral distances. Several, previously unknown mud volcanoes and the areal extent of individual mud flows are also mapped and underline the strong variability in probably both space and time of the mud expulsion phenomena. These images will be shown and their distribution discussed in the light of the great availability of microbial gas in Black Sea sediments. In the deep Black Sea available gas should form gas hydrates, but where are do these accumulate? Bottom simulating reflectors that indicate the base of the hydrate stability zone are rather rare in the Black Sea.