, with maximum depth being said to be approximately . Despite the three-month mission time allowed by its nuclear reactor and ample food stores it usually operates in conjunction with a specialized tender, a refurbished Delta III-class submarine BS-136 Orenburg, which has its missile shafts removed and fitted with a special docking cradle on its bottom. Konsul-class DSV Konsul a class of Russian military DSVs currently deployed onboard the Russian oceanographic research ship Yantar. It is reported that the submersible and its sister sub Rus are used to conduct seafloor surveillance of marine communications cables and western underwater surveillance devices. They are somewhat smaller than the Mirs, accommodating a crew of two instead of three, but are purely domestically produced vessels and have a higher maximum depth due to their titanium pressure hulls: during the tests the original Konsul dove to . Nautile Nautile a DSV owned by Ifremer, the French Research Institute for Exploitation of the Sea. The titanium-hulled Nautile is capable of diving to . Shinkai DSV Shinkai JAMSTEC (Japan Agency for Marine-Earth Science and Technology) operates a DSV series called Shinkai ("Deep Sea"). The latest DSV is Shinkai 6500 which can submerge to with three crew members. JAMSTEC was operating a ROV called Kaikō, which was able to submerge to , but was lost at sea in May 2003. Pisces-class DSV Pisces-class DSV three-person research submersibles built by International Hydrodynamics of Vancouver in British Columbia with a maximum operating depth of capable of dive durations of 7 to 10 hours. A total of 10 were built and are representative of late 1960s deep-ocean submersible design. Two (Pisces IV and Pisces V) are currently operated by National Oceanic and Atmospheric Administration and the first production vehicle is on display in Vancouver. Pisces VI is undergoing retrofit. Sea Pole-class bathyscaphe Bathyscaphe series designed by the People's Republic of China, and there are three derivatives known to exist by 2010: Sea Pole-class bathyscaphe 1 built, 2nd unit developed into Jiaolong (Described below) Jiaolong-class bathyscaphe Subclass of Sea Pole class, 1 built. Harmony-class bathyscaphe Subclass of Jiaolong class, 1 built. Fendouzhe DSV Fendouzhe, or Striver-class a Chinese DSV that dove to an estimated depth of 10,909 meters in the Mariana Trench on November 10, 2020, the deepest ever for a Chinese submersible. It was supported by its mother ship, the Tansuo-1 (Exploration-1) and its development began in 2016. The chief designer