On 1–3 June 2008, during Leg 1, the Japanese robotic deep-sea probe "ABISMO" (Automatic Bottom Inspection and Sampling Mobile) on dives 11-13 almost reached the bottom about east of the Challenger Deep: "Unfortunately, we were unable to dive to the sea floor because the legacy primary cable of the Kaiko system was a little bit short. The 2-m long gravity core sampler was dropped in free fall, and sediment samples of 1.6m length were obtained. Twelve bottles of water samples were also obtained at various depths..." ABISMO's dive #14 was into the TOTO caldera (12°42.7777 N, 143°32.4055 E), about 60 nmi northeast of the deepest waters of the "central" basin of the Challenger Deep, where they obtained videos of the hydrothermal plume. Upon successful testing to , JAMSTEC' ROV "ABISMO" became, briefly, the only full-ocean-depth rated ROV in existence. On 31 May 2009, the ABISMO was joined by the Woods Hole Oceanographic Institution's HROV "Nereus" as the only two operational full ocean depth capable remotely operated vehicles in existence. During the ROV "ABISMO's" deepest sea trails dive its manometer measured a depth of ± in "Area 1" (vicinity of 12°43' N, 143°33' E).