The edge of the collapse basin is marked by extremely steep slopes capped by thin carbonate deposit. Clam beds, bacterial mats and rock fish, anemones and carbonate cobbles are hosted on the rim. Credit: D. Kelley, University of Washington/NSF/WHOI.

The collapse zone at Pythias Oasis hosts thick yellow and white bacterial mats, here about to be sampled with a push core held in Jasons' manipulator. Credit: D. Kelley, University of Washington/NSF

Lightening on the horizon celebrates Sentry diving at Pythias Oasis during the UW-OSU expedition funded by NSF. Credit: M. Elend, University of Washington.

Flaming methane hydrate following recovery of a core from Pythias Oasis. Credit: M. Elend, University of Washington.

Jason is recovered onboard the R/V Atlantis after completing a dive at Pythias Oasis. Credit: M. Elend, University of Washington.

Katie Gonzalez tries on Janel Hershey’s novelty seasickness goggles. Credit: K. Gonzalez, University of Washjington;V19

Janel Hershey Working on Deck

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University of Washington undergraduate students, Katie Gonzales and Eve Hudson process hydrothermal vent fluids taken from more than a mile beneath the oceans surface at the summit of Axial Seamount. Credit: M. Elend, University of Washington. V19.

Tyee Middle School teacher, Janel Hershey, processes hydrothermal fluids collected from nearly a mile beneath the oceans' surface. Credit: M. Elend, University of Washington; V19.

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"Squished" styrofoam cups taken down of the remotely operated vehicle Jason.

A cluster of healthy tubeworms characterize the John Casey vent on the side of the El Guapo edifice. Credit; UW/NSF-OOI/WHOI; V19.

A cluster of tube worms and sulfide worms colonize the 'John Casey' site on El Guapo. Credit: UW/NSF-OOI/WHIO; V19.

The John Case bent as seen in 2019 on the side of El Guapo. Credit: UW/NSF-OOI/WHOI; V19.

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Beautiful colonies of purple blue protists colonize the Tiny Towers site in the International District Hydrothermal Field. Credit. UW/NSF-OOI/WHOI; V19.

New black smoker in John Casey venting site on El Guapo. Credit: UW/NSF-OOI/WHOI;V19.

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John Casey May 22, 1935-June 30, 2019