Porewater and gas seepages through the seafloor have become the target of frontier research over the last decade. Such seepages occur worldwide and at water depths to over 5000 m. The seep locations are often identified by use of high‐resolution shallow seismic systems. Data examples and case studies from the North Sea, the Skagerrak, offshore Mid Norway, and the Persian and Mexican Gulfs are presented and discussed. Such terms as “acoustic turbidity,” “acoustic voids,” “enhanced reflectors,” and “wipe out zones” will also be discussed.