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Ultra-High Resolution seismic images are more and more commonly used before installing an offshore wind turbine. The small sampling recorded by the dedicated acquisitions enables to image the subsurface with a resolution lower than 1 meter. To fully appreciate this resolution, comprehensive data processing and imaging must be applied, compensating for sea state variation and possible navigation uncertainties. Removing the ghost energy and stabilizing the emitted wavelet are crucial steps to retrieve the full resolution of the data, increasing bandwidth on both low and high frequency sides. The limited recorded information in the low frequency, below 100Hz, can be recovered through velocity model building, enabling further acoustic and possibly elastic inversion.