In deepwater regions of the Gulf of Mexico, the ability to image subsalt structures has improved significantly with wide-azimuth data, reverse time migration, and anisotropic tomography and imaging. However, subsalt imaging, such as imaging steeply dipping salt flanks and subsalt three-way closures, still remains difficult in areas with complex salt geometry. Moreover, limited subsalt illumination provides insufficient incident angles for residual curvature tomographic analysis. Full-azimuth and long-offset acquisition configurations are the latest acquisition technologies designed to address these subsalt challenges. An improved subsalt imaging and tomography updating using staggered acquisition provides full-azimuth data coverage and ultralong offsets.