In this clip, we see how a sediment core is taken from Green Canyon. Here the submersible pilot grabs one of corers with the manipulator and pushes it into the sediment. These sediments are highly gas-charged, and during the retrieval procedure the plume was emanating into the water column. Most likely, this gas consists of methane, which is a very strong greenhouse gas component. Video courtesy of Expedition to the Deep Slope, NOAA-OE.
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