{"id":7306,"date":"2022-02-09T08:26:33","date_gmt":"2022-02-09T07:26:33","guid":{"rendered":"https:\/\/www.mio.osupytheas.fr\/fr\/archive_page\/jour-9\/"},"modified":"2022-02-09T08:26:33","modified_gmt":"2022-02-09T07:26:33","slug":"jour-9","status":"publish","type":"archive_page","link":"https:\/\/www.mio.osupytheas.fr\/en\/day-9\/","title":{"rendered":"Day 9"},"content":{"rendered":"
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08 February 2022<\/h2> <\/div>

Operation Nautile<\/strong><\/p>

The conditions finally allow the submarine to resume its operations. Olivier, Frank and Carl have a long day ahead of them!
Today's mission is to move the infrastructures from the seabed to their target point, remove their crow's feet (immersion straps) and unwind the cables needed for the connections using the Nautile's electronic arms. The pilots are now accompanied by Carl, a research engineer at the CNRS. As the man behind the technical design of the devices at the bottom, he knows them best!\u00a0<\/p>

I invite you to follow the deployment of the Nautile step by step...<\/p>

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Photo credit :C\u00e9line Rommevaux<\/em><\/span><\/p> <\/div> <\/div>

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The Nautile never leaves alone<\/strong><\/p>

The submarine is launched using the lift-line, the line that gently carries the craft to the surface.
But what is the diver doing on the roof of the Nautile? Today, it's Heinrich who is assigned to this position, and he's initiating the first stage in the detachment of the Nautile!<\/p>

When the Nautile is in the water, the diver unhooks the lift-line. The submarine remains attached to the vessel by the cable shown in the photo at the front of the device - known as the winch or axial. It acts as the last link with the submarine and keeps it in line with the boat. The diver then activates the Nautile's locator beacon located at the front of the craft - known as the Gonio. This will help the team on the surface to locate the submarine in the water. Then, after the intervention of two scuba divers, he retrieves the blue bridle that attaches the axial to the Nautile.<\/p>

You have to be alert and prepared. It's hard to keep a steady hand against a 19-tonne machine in the swell.\u00a0\u00a0<\/p>

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Photo credit: Nicolas Fromont - @nicolasfromontphoto<\/em><\/span><\/p> <\/div> <\/div>

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The divers<\/strong><\/p>

At the same time, a team is on the water: it is responsible for the second stage of detaching the Nautile. Their boat is always positioned to the right of the Nautile and sends out two bottle divers who have to unhook the axial and the crow's foot (in blue on the previous photo). When the crow's foot is removed, it is given to the diver on top of the apparatus. Coordination between them is extremely precise, as all three are subject to the same risks.
The tank divers take a tour of the Nautile underwater to ensure that everything is correctly in place before it is submerged. They are all picked up by the boat and returned aboard the Why not?<\/em><\/p>

This extremely precise technical choreography is to be commended, enabling the Nautile to dive safely!\u00a0<\/p>

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Photo credit: Nicolas Fromont - @nicolasfromontphoto<\/em><\/span><\/p> <\/div> <\/div>

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Back on board<\/strong><\/p>

The team returns to the ship by means of a suspended ladder, and the boat is raised last using the line used to send the equipment to the bottom!<\/p>

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Photo credit: Nicolas Fromont - @nicolasfromontphoto<\/em><\/span><\/p> <\/div> <\/div>

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Launching the Biocam<\/strong><\/p>

Tonight, it's the Biocam's turn to reach the EMSO-LO site at a depth of 2400m. This device, developed byFrench National Institute for Nuclear and Particle Physics<\/a>\u00a0which is designed to capture bioluminescence images. It is equipped with two intelligent cameras that can reconstruct the bioluminescent organisms observed in three dimensions. This data will complement the images taken by BathyBot's hypersensitive camera. The researchers hope to be able to associate the different forms of bioluminescence with families of organisms. Understanding bioluminescence to identify species is the dream of many scientists!<\/p> <\/div> <\/div>

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Zooplankton on board!<\/strong><\/p>

Marthe is interested in the bioluminescence of the seedlings that she collects using a net, and today several animal species are taking part in a photo shoot!
The organism on the top left belongs to the gastropod family, a pteropod. This Greek word means \"winged feet\". Two wing-like structures are actually the feet of this gastropod. When it is in motion, it is reminiscent of a butterfly. After all, it's the same principle of locomotion, but in a different environment.<\/p>

The organism on the bottom right is a copepod. It belongs to the crustacean family, which has an external skeleton, unlike the pteropod, which is a mollusc with a soft body.<\/p>

Zooplankton is an important element in the cycle of life. They are the first link in the food chain and transfer atmospheric carbon dioxide from the surface to the oceanic crust. Global warming is having an effect on these populations...<\/p>

Take the example of the pteropod described above, which belongs to the gastropod family, many of whose species have a shell. The same applies to planktonic species, which also have shells. Unfortunately, the ocean is becoming more acidic, making the shells more fragile and slowing down their growth. The acidification of the water is explained by the increase in atmospheric carbon dioxide, which is dissolved more and more in the oceans. This phenomenon lowers the pH of the water, making it more acidic. Planktonic species with shells, which help to sequester carbon on the ocean floor, are now threatened by the dissolution of carbon dioxide in the water. A sad commentary.<\/p>

Photo credit: Marthe Vienne<\/em><\/span><\/p> <\/div> <\/div>

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\u2190 Previous day<\/strong><\/a><\/p> <\/div> <\/div>

Next day \u2192<\/strong><\/a><\/p> <\/div> <\/div> <\/div> <\/div> <\/div><\/section><\/div><\/div><\/div><\/div> <\/div> <\/div> <\/div> <\/div><\/div>","protected":false},"featured_media":4489,"parent":0,"template":"","class_list":["post-7306","archive_page","type-archive_page","status-publish","has-post-thumbnail","hentry"],"acf":{"id_old":"3612","category_old":"EMSO-LO \/ BathyCruise"},"_links":{"self":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/archive_page\/7306","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/archive_page"}],"about":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/types\/archive_page"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/media\/4489"}],"wp:attachment":[{"href":"https:\/\/www.mio.osupytheas.fr\/en\/wp-json\/wp\/v2\/media?parent=7306"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}