Mission Accomplished: Photos from Dawn's Challenger Deep Expedition

• Read original article here

On July 12, Esri Chief Scientist Dawn Wright made history as she dove to the deepest place on Earth, Challenger Deep. Her mission? To use high-resolution sonar to map a part of our planet in never-before-seen detail. Here are 30 photos from her expedition, including images from Challenger Deep, 10,919 meters below the surface, maps from the expedition, and scenes taken within the sub.

The expedition began in Guam, where Dawn loaded Caladan Oceanic’sDSSV Pressure Drop ship to journey to Challenger Deep.

Here, Dawn, on left, is standing at port in Guam withRochelle Wigley ofMap the Gaps and the University of New Hampshire. They proudly hold the Seabed 2030 flag before the expedition. Rochelle was responsible for processing and mapping the bathymetric data collected by the ship’s sonar. She also prepared planning maps for the submersible dives and instrument deployments.

New data from this expedition is being submitted toSeabed 2030 (a UN program to map the global seafloor in detail by 2030) and ArcGIS Living Atlas of the World, the foremost collection of geographic information from around the globe. 

Onboard the ship, mapping is done with the Kongsberg EM-124 sonar system. This image shows Globie, the Esri mascot, in front of the sonar monitor. Dawn gave Globie to Rochelle to show appreciation for her work during the expedition. She put in 17 to 18 hours most days and kept Globie at the helm of the sonar system monitor.

This image shows the processing computer’s monitor. Displayed is the latest bathymetric data collected from the Challenger Deep portion of the Mariana Trench by the ship’s multibeam sonar system. The data shown here are gridded at 100-meter resolution, meaning one pixel per 100 square meters of the ocean floor, which is a great scale for general visualization and understanding. However, for dive planning, more detailed, site-specific mapping was generated at an image quality of 10-meter resolution to allow for visual interpretation and inspection. 

Here, a regional bathymetry map shows the three major depressions within Challenger Deep – the Eastern, Central, and Western Pools. 200-m contours (the area within a section showing the elevation for that section) are shown in thin black, 100-m contours are shown in bold black, to highlight the pools, and 20-m contours are shown in bold red. This data was collected by the ship’s EM-124 multibeam echosounder.

Dawn and Victor Vescovo descended to a previously unexplored part of the Western Pool at ~142deg12’ E longitude. After her dive, Dawn was presented with a 37×26” printout of the map signed by members of the expedition team and ship’s crew.

The day before the dive, Dawn practiced getting into and out of the sub. She wanted to get a feel for where the rungs were located and where to turn and step when lowering herself down into the personnel sphere.

During this practice session, Dawn and her roommate, Kate Wawatai, climbed into the sub. Kate gave Dawn an instrument panel and safety briefing. Kate Wawatai is the only female member of the submersible support team and a fine submersible pilot in her own right. Kate is from New Zealand and hopes to one day pilot the sub to the deepest part of the Kermadec Trench, a sacred place in Maori history and culture.

Here, Dawn enters the sub on July 12, 2022 (Guam time), under the watchful eye of Shane “Speedo” Muhl, the sub support “swimmer” (one who swims out with the sub and hooks or unhooks its final tethering). Learn more about what Dawn brought with her inside the sub inthis video.

Dive Route: This ​​map shows the dive route for Dawn and Victor’s mission. They brought the map into the sub and the sub team’s mission control used it on the ship to track them. The data source is again EM-124 bathymetry contoured at 10 m except for 100 m contours in bold to highlight the pools and 20 m contours in red.

For the most part, Dawn and Victor successfully followed this track while diving, but they had to adjust for the drift of bottom currents as they traveled. Most of the first-ever sidescan sonar surveying at the deepest parts of our ocean was conducted along the southern wall between target points 3 and 4.

Dawn and Victor share a light moment in the sub during the 4-hour descent to Challenger Deep. Victor is controlling the sub joystick. Dawn is holding the dive planning map. Dawn’s Snoopy is safely positioned over the starboard dashboard.

Touch Down Selfie! Dawn and Victor take time for a selfie after reaching the seafloor at an initial depth of 10,904 meters below sea level. Photo credit: Victor Vescovo.

What did they see immediately upon touching the bottom? A BEER BOTTLE! Dawn: “This is further evidence that we as humanity MUST as humanity do BETTER by the ocean and the habitats that we ourselves share and ultimately depend on. There is no Planet B!”  Watch a video of this moment here.

Two white, tube-dwelling anemones of the genus Galatheanthemum grow out of a basaltic rock formation in Challenger Deep. This is the only genus of this organism to be found at this extreme depth.

Dawn: “The strangest lifeforms that we encountered during the dive were these hydroids growing out of the basaltic rocks. These hydroids were identified by Dr. Alan Jamieson of the University of Western Australia.”

Here, Dawn’s laptop screen shows data being collected by the sidescan sonar system as the sub traverses the southern wall of the Western Pool of Challenger Deep. Given the sub’s positioning at the time, the features of the wall are shown in the right and left portions of the laptop’s screen. The middle of the readout is the null region of no data in between the instruments’ two transducers.

Notice the chunky basaltic rocks seen at the bottom. These rocks are located in the subduction zone where the Pacific Plate subducts beneath the Philippine Plate. Dawn aptly has named this area “Flintstones quarry.”

Ascending: Snoopy kept watch for Dawn over her Starboard dashboard. The depth indicator to the far-left shows that at the time of the photo Dawn and Victor had ascended to 1019 meters, and thus were almost “home.”

Dawn and Victor celebrate after a successful dive of 10.5 hours, reaching a maximum depth of 10,919 +/- 6 meters, and including 2.5 hours of visual observation and sidescan sonar surveying on the bottom.

The expedition and celebration continue! Here, Dawn speaks by satellite speaker phone with two of her scientific heroes: Alondra Nelson(White House Office of Science and Technology Policy deputy director for science and society) and Jane Lubchenco (White House Office of Science and Technology Policy deputy director for climate and environment), who asked her to reflect upon and discuss the importance of the Challenger Deep dive. At the time of this photo, the ship was transiting from Challenger Deep to the next dive site at the Yap Trench.

While the ship stopped above the Yap Trench, for the next submersible dive of Victor and Master Navigator Sesario Sewalrur to Yap Trench, Dawn assisted CBS News cameraman Roger Masterson by catching his drone for him, to protect it from landing dangerously on a wet, rolling ship deck.

Dawn: “Is it fun building with LEGO_Group® bricks at sea? What a question?! OF COURSE, IT IS!”

It was a real joy for Dawn to sail with these inspiring women, from L to R:

Nicole Yamase, the first Pacific islander to Challenger Deep and a doctoral student at the University of Hawaii; Kate Wawatai, as described earlier; Dawn, and Tamara Greenstone Alefaio, the program manager of the Micronesia Conservation Trust.

Dawn: “This is one of my favorite photos. Super submarine tech Kate Wawatai, explorer and owner extraordinaire Victor Vescovo, and I celebrate at the conclusion of the expedition! When I wasn’t wearing my Esri cap, I wore a Stanford cap to honor Victor as a Stanford alumnus ????.

Some of Dawn’s priceless treasures from Challenger Deep include: (1) a special pin presented to her by the expedition leader and designed by Don Walsh, the first person to dive to Challenger Deep. The pin depicts two sea creatures flanking the Trieste, the vessel in which Don Walsh and Jacques Piccard dove to Challenger Deep. (2) Dawn’s name and ship name panels for her dive suit, as given to her by the sub-support crew; (3) Palau’s very unique passport stamp at the end of the expedition; and (4) a styrofoam cup shrunk under hydrostatic pressure of 16,000 psi, the same pressure that the sub experienced.