Imaging below gas is a robust application of four-component (4C) seabed seismic, Imaging of faults and the crest of the structure under the gas cloud have been improved. Conventional streamers record only the pressure (P)-waves and suffer from very-low signal/noise ratio and pull-down under the gas cloud. P-waves converted to shear (S)-waves, PS-waves, are largely unaffected by fluids. Multicomponent methods have been developed, including normal moveout (NMO), dip moveout (DMO), and binning, to improve converted wave processing, The migrated pressure wave images show good imaging of the steep flank segments, distortion under the gas-invaded zone, and poor event continuity in the crestal feature. The converted wave images show similar structure and good continuity under the gas.