WEBVTT
Kind: captions
Language: en

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Aboard the research vessel Thomas G.
Thompson, USGS researchers and crew

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members prepare to deploy a gravity-driven
coring barrel from the ship's stern.

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The 15-foot-long, 1,250-pound coring
barrel is raised with an A-frame and winch

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then lowered to the sea floor, where its
weight drives a cylindrical core into the

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seafloor sediment of Escanaba Trough.

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Once the core is collected, the coring
barrel is winched back up to the ship.

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Researchers extract the sediment
core from the barrel,

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and measure, cut, and cap off the
meter-and-a-half-long core

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sections to be analyzed later in
laboratories onshore.