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The head of an instrument, built by W. Seyfried and K. Ding, which measures temperature, pH, and H2S is inserted into 309°C flow issuing from the vent called Diva. Credit: UW/NSF-OOI/WHOI; V19.

The head of an instrument that measures temperature, pH, and H2S is inserted into 302°C flow issuing from the vent called Diva. Credit: UW/NSF-OOI/WHOI; V19.

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309°C hot spring fluids spew from the orifice of Diva subsequent to taking a temperature measurement. Credit: UW/NSF-OOI/WHOI;V19.

Jason takes and IGT (isobaric gas-tight) sample in the orifice of the 309°C chimney called Diva in the International District Hydrothermal Field (1520 m). Credit: UW/NSF-OOI/WHOI; V19.

A spider crab and 1500 m water depth walks across a glassy, jumbled sheet flow in the International District vent field. Credit: UW/NSF-OOI/WHOI; V19.

Unhappy tube worms covered in feathery strands of filamentous bacteria and purple-blue protists cover a small area on the active chimney called Escargot in the International District Hydrothermal Field. Credit: UW/NSF-OOI/WHOI; V19.

Jason takes a temperature measurement (left) in the 309°C venting anhydrite- and CO2-rich hot spring called Diva. Oxidized sulfide mineral deposits are to the right. Credit: UW/NSF-OOI/WHOI; V19.

A high temperature data logger resides in the orifice of the 309°C anhydite-rich little chimney called Diva. Credit: UW/NSF-OOI/WHOI; V19.

Aft crane on Atlantis. Credit: Keith Jiang, University of Washington, V19

Safety Drill Credit: M. Elend, University of Washington V19

US Coast Guard pilot going back to shore. Credit: M. Elend, University of Washington,V19

Microbial mats cover expansive areas of the Smokey Caverns site, which hosted exposed gas hydrate in 2017. Credit: UW/OOI-NSF/WHOI: V19.

A layer of lantern fish hovers in the shallow waters above the methane seep site at Southern Hydrate Ridge, perhaps in response to enhanced microbial activity in this zone. Credit: UW/NSF-OOI/WHOI; V19.

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The Deep Profiler vehicle installed since 2018 at the Oregon Offshore site is recovered onto the deck of the R/V Atlantis. Credit: M. Elend, University of Washington; V19.

Jason being brought onboard the R/V Atlantis with the Deep Profiler safely secured onto the front of the vehicle at the end of dive J2-1186. Credit: M. Elend, University of Washington; V19.

A squadron of albatross wonder what large yellow creature rises from the deep. Credit: M. Elend, University of Washington; V19.

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