Several dives during the 2017 Gulf of Mexico Okeanos Explorer expedition found low relief, sediment covered mounds that may contain a core of gas hydrate mixed with sediment and carbonate rock.  The mounds probably form as the underlying gas supply builds up a hydrate deposit beneath and on the seafloor.   This mound found during Dive 17 has exposed hydrate just below the peak and a bubble stream visible in the photo.

During several dives on the Okeanos Explorer Gulf of Mexico 2017 expedition, we found low relief, sediment-covered mounds that may contain a core of gas hydrate mixed with sediment and carbonate rock. The mounds probably form as the underlying gas supply builds up a hydrate deposit beneath and on the seafloor. This mound found during Dive 17 has exposed hydrate just below the peak and a bubble stream visible in the center of the photo. Image courtesy of the NOAA Office of Ocean Exploration and Research, Gulf of Mexico 2017.

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