visited for the first time by French bathyscaphe Archimède in 1964 and then by a robotic vehicle in 2012. The most conspicuous aspect of the footage was the swarm of benthic amphipods. Some of these amphipods were collected by bait bags attached to the vehicle and were brought to the surface for further analysis. The samples recovered were Scopelocheirus schellenbergi, a species of lysianassid amphipod that have so far only been found in ultradeep trenches in the Pacific. Two invertebrate creatures were also observed in the video. One soft dark individual, estimated to be long, has been identified by Dr. Stace E. Beaulieu of Woods Hole Oceanographic Institution as a sea cucumber, tentatively assigned to genus Peniagone. The other individual, a small crustacean, is tentatively identified as a munnopsid isopod, based on morphology and similar walking and jumping movements observed for other hadal munnopsid isopods. Because these individuals were not collected, it is not possible to obtain species-level identifications. However, these sightings likely exceed the deepest known records for genus Peniagone and family Munnopsidae. Crewed descent The American explorer Victor Vescovo dived to the deepest point of the Puerto Rico Trench and therefore the Atlantic Ocean on 19 December 2018, as part of the Five Deeps Expedition. He reached a depth of ± at 19°42'49" N, 67°18'39" W by direct CTD pressure measurements with the Deep-Submergence Vehicle DSV Limiting Factor (a Triton 36000/2 model submersible) and thus became the first person to reach the bottom of the Atlantic Ocean while also making the second-deepest recorded solo dive in history at that time. Many media outlets referred to the deep as Brownson Deep, in opposition to past references to the area, where the term Milwaukee Deep was used instead. The operating area was surveyed by the support ship, the Deep Submersible Support Vessel DSSV Pressure Drop, with a Kongsberg SIMRAD EM124 multibeam echosounder system. The gathered data will be donated to the GEBCO Seabed 2030 initiative. The dive was part of the Five Deeps Expedition. The objective of this expedition was to thoroughly map and visit the deepest points of all five of the world's oceans by the end of September 2019. See also Mariana Trench Plate tectonics List of oceanic trenches References External links Mapping of the Puerto Rico Trench, the Deepest Part of the Atlantic, is Nearing Completion – United States Geological Survey Workshop Addresses Tsunami Hazard to Puerto