Question: Speleonaut, is the submersible used by the cave diver Jochen Hasenmayer, after the 1989 decompression accident that left his legs paralyzed, Hasenmayer designed the "Speleonaut" with his friend Konrad Gehringer in order to continue exploring the Blauhöhle cave system, which begins at the base of which spring that serves as the source of the river Blau in the karst landscape on the Swabian Jura's southern edge, in Southern Germany?

full_context: Document 1: Blau (Danube): The Blau (] ) is a 15 km long river in Baden-Württemberg, southern Germany, and a left tributary of the Danube. The source of the Blau is the karst spring of "Blautopf", in the town Blaubeuren, in the Swabian Jura. It flows east through Blaustein to the city of Ulm, where it empties into the Danube.
Document 2: Argonaut Junior: The Argonaut Junior was the first successful submarine built by engineer Simon Lake. Her main attribute, like that of the sub built by Lake in 1897, Argonaut (submarine), was an air lock. Her dimensions were length 14ft, beam 4 ft, depth 5 ft. Different sources incorrectly identify "Argonaut No 1", and "Argonaut No 2" as the name of this vessel. "Argonaut No 1" was built in 1897 and is 36 feet in length, "Argonaut No 2" was a reconstruction of "Argonaut No 1" finishing in 1900 with a length of 60 feet and significantly different profile.
Document 3: Speleonaut: Speleonaut (named from the Greek words for "cave" and "sailor") is the submersible used by the cave diver Jochen Hasenmayer. After the 1989 decompression accident that left his legs paralyzed, Hasenmayer designed the "Speleonaut" with his friend Konrad Gehringer in order to continue exploring the Blauhöhle cave system, which begins at the base of the Blautopf spring in the Swabian Jura mountain range. The "Speleonaut" is 72 cm wide and has nine engines, making it easy to maneuver in all directions. It is the first submarine designed specifically for the exploration of caves. According to Hasenmayer, the "Speleonaut" has been tested in Lake Constance to a depth of 105 m and has a design limit of 180 m .
Document 4: Blautopf: The Blautopf (German for "Blue Pot"; "blau" means "blue", "Topf" means "pot") is a spring that serves as the source of the river Blau in the karst landscape on the Swabian Jura's southern edge, in Southern Germany.
Document 5: Sirgenstein Cave: The small Sirgenstein Cave, German: "Sirgensteinhöhle" is situated 565 m above sea level inside the 20 m high "Sirgenstein", a limestone rock. The cave sits 35 m above the Ach River valley bottom in the central Swabian Jura, southern Germany. Archaeologist R. R. Schmidt excavated the site in 1906 during which he identified indices of prehistoric human presence. He recorded the complete stratigraphic sequence of Palaeolithic and Neolithic origin. In his 1910 analysis Schmidt inspired future archaeologists with his pioneering concept of including the excavation site within its geographic region, contextualizing it within a wide scientific spectrum and demonstrated valuable results as he correlated the Sirgenstein layer structure to those of prehistoric sites in France.
Document 6: UC3 Nautilus: UC3 Nautilus is a privately built Danish midget submarine. It was built over a three-year period as an art project by Peter Madsen and a group of volunteers, and cost approximately US$200,000 to build (1.5 million DKK). The submarine was Madsen's third submarine design, and at the time of launch on 3 May 2008, was the largest privately built submarine in the world.
Document 7: Blauhöhle: The Blauhöhle is the largest cave system in the Swabian Alps in southern Germany. The Blauhöhle presumably originated in a time when the Danube still flowed through the Blau valley. Since the shifting of the Danube, several small rivers, the Schmiech, the Ach, and the Blau, have flowed through this valley. The cave system begins about 21 meters under water at the base of the Blautopf. It continues west and northwest, rising and falling several times until after a horizontal distance of about 1200 m it comes above the level of ground water and opens into the second big air-filled chamber. The maximum depth of the cave under water is 42 m .
Document 8: Jochen Hasenmayer: Jochen Hasenmayer (born 28 October 1941 in Pforzheim, Germany) is a German speleologist and cave diver from Birkenfeld in Baden-Württemberg, whose spectacular dives have frequently made headlines.
Document 9: Wutach Gorge: The Wutach Gorge (German: "Wutachschlucht" ) is a narrow, steep-sided valley in southern Germany through in the upper reaches of the River Wutach with three gorge-like sections, the lowest of which is also called the "Wutachflühen". The gorge cuts through the southern part of the Baar region from the eastern side of the High Black Forest heading eastwards to the "Trauf" the steep, northwestern flank of the Swabian Jura, which transitions to the Randen mountains here.
Document 10: UC2 Kraka: Kraka, or "UC2 Kraka" was an amateur-built midget submarine completed in 2005, the first diesel-electric amateur sub in Denmark. It was built by Peter Madsen, Claus Nørregaard and several other people. The overall length was 12.6 meters and it displaced 6 tonnes. The propulsion was diesel-electric with a 16 hp diesel engine and an 8 hp electric motor. Kraka can be seen at Denmark's Technical Museum in Elsinore (aka Helsingør).
Document 11: Joseph-Martin Cabirol: Joseph-Martin Cabirol was a French man. In 1855 he patented a new model of standard diving dress in Paris, mainly from Augustus Siebe's designs, and afterwards he made them. The suit is made out of rubberized canvas. The helmet, for the first time, includes a hand-controlled tap that the diver uses to evacuate his exhaled air. The tap includes a safety valve which stops water from entering the helmet. Until 1855 diving helmets were equipped with only three circular windows (front, left and right sides). Cabirol's helmet introduced the later well known fourth window, in the upper front part of the helmet and letting the diver watch above him. Having been presented to the "Exposition Universelle" in Paris Cabirol's diving dress won the silver medal. This original diving dress and helmet are now preserved at the "Conservatoire National des Arts et Métiers" in Paris.
Document 12: Blau (Danube): The Blau (] ) is a 15 km long river in Baden-Württemberg, southern Germany, and a left tributary of the Danube. The source of the Blau is the karst spring of "Blautopf", in the town Blaubeuren, in the Swabian Jura. It flows east through Blaustein to the city of Ulm, where it empties into the Danube.
Document 13: Deepsea Challenger: Deepsea Challenger (DCV 1) is a 7.3 m deep-diving submersible designed to reach the bottom of Challenger Deep, the deepest-known point on Earth. On 26 March 2012, Canadian film director James Cameron piloted the craft to accomplish this goal in the second manned dive reaching the Challenger Deep. Built in Sydney, Australia by the research and design company Acheron Project Pty Ltd, "Deepsea Challenger" includes scientific sampling equipment and high-definition 3-D cameras, and reached the ocean's deepest point after two hours and 36 minutes of descent from the surface.
Document 14: Blauen (Badenweiler): The Blauen or Hochblauen is a 1,165 m mountain in the southern Black Forest. The peak lies within the municipalities of Schliengen and Malsburg-Marzell in Landkreis Lörrach and the community of Badenweiler in LandkreisBreisgau-Hochschwarzwald. It is an ideal viewpoint with views of the Black Forest, Vosges, Jura Mountains, and the Alps.
Document 15: Aquanaut: An aquanaut is any person who remains underwater, breathing at the ambient pressure for long enough for the concentration of the inert components of the breathing gas dissolved in the body tissues to reach equilibrium, in a state known as saturation. Usually this is done in an underwater habitat on the seafloor for a period equal to or greater than 24 continuous hours without returning to the surface. The term is often restricted to scientists and academics, though there were a group of military aquanauts during the SEALAB program. Commercial Divers in similar circumstances are referred to as Saturation Divers. An aquanaut is distinct from a submariner, in that a submariner is confined to a moving underwater vehicle such as a submarine that holds the water pressure out. Aquanaut derives from the Latin word "aqua" ("water") plus the Greek "nautes" ("sailor"), by analogy to the similar construction "astronaut".
ground_truth: Blautopf