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Oceanography and Mine Warfare
Figure 3-3 An acoustic imagery mosaic with one meter resolution. On this image numerous "pockmarks" can be seen. These features are likely to have resulted from seafloor release of hydrocarbon gases.
Figure 3–4 A pair of acoustic imagery mosaics collected four days apart. Comparison of the older image on the left and the newer image on the right shows the appearance of a mine-like contact in the time between the collection of the two images.