Question: What was the length of the midget submarine built in 2005 by the founder and CEO of RML Spacelab ApS?

full_context: Document 1: Russian submarine Forel: Forel (Russian: Форель , German: "Forelle" - Trout) was a midget submarine designed by Raimondo Lorenzo D’Equevilley-Montjustin and built by Krupp in Kiel, Germany. The design was an experimental design built as a private venture by Krupp in hopes of attracting a contract from the Imperial German Navy. Although the design proved moderately successful, the submarine did not attract German naval attention. She was purchased by the Imperial Russian Navy in 1904 and served with the IRN until she was lost in a diving accident in 1910. She had the distinction of being the first submarine to have been built in Germany, preceding SM U-1. "Forel" was succeeded in service by the "Krab" class (one ship).
Document 2: Peter L. Jensen: Peter Laurits Jensen (16 May 1886 – 26 October 1961) was a Danish American engineer, inventor and entrepreneur. He founded Magnavox Company and Jensen Radio Manufacturing Company.
Document 3: Peter Madsen (inventor): Peter Langkjær Madsen (] ; born 12 January 1971) is a Danish aerospace engineering enthusiast, "art engineer", submarine builder, entrepreneur, co-founder of the non-profit organization Copenhagen Suborbitals, and founder and CEO of RML Spacelab ApS.
Document 4: UC1 Freya: Freya or "UC1 Freya" (in Danish: "Freja") was the first private Danish submarine, and thus first amateur electric sub in Denmark. It was built by Peter Madsen and Claus Nørregaard in 2001-2002, as a demonstrator to try submarine technology. Having made over 500 dives, it was decommissioned, as it was not designed for a long service life. It was decommissioned in 2006 after UC2 Kraka had been worked up. The submarine was then docked and allowed to decay. Final decontamination was done, and it was towed out to sea by UC3 Nautilus, in August 2008, and sunk as an artificial reef near Copenhagen.
Document 5: Ampyx Power: Ampyx Power is an airborne wind energy company founded in 2008 by Bas Lansdorp and Richard Ruiterkamp. It was created after Lansdorp dropped his five-year-long studies of wind energy at Delft University of Technology to found Ampyx Power. In 2011, Lansdorp sold a majority of his Ampyx Power shares to fund his new project, Mars One. Wubbo Ockels' interest in energy began when he let a kite line slip and it burned his hand. He became interested and started to study and research how this could be turned into electricity. At Delft University, he formed a team with Bas Lansdorp that worked on developing kites that could retrieve energy from the sky. Richard Ruiterkamp became the team leader and he created a fixed wing aircraft that allowed greater controllability and allowing the generation of more energy. In 2008 he founded the company with Bas Lansdorp. Lansdorp worked on the business aspect, and Ruiterkamp was head of the science division. Currently, Ampyx Power has a team of 40 engineers. Their current prototype is the AP3 Ampyx Power Airborne Wind Energy System (AWES). The system is a tethered aircraft that converts wind into electric energy. The aircraft is tethered to an on the ground generator. When the aircraft moves and flies, it reels the tether and powers the generator. The plane is then reeled in through the tether and then re-released into the air.
Document 6: Type 032 midget submarine: The Type 032 midget submarine and its experimental version Type 032-1 belongs to a family of midget sub developed by the People's Liberation Army Navy (PLAN) in the late 1950s, and it was one of the first submarine indigenously developed in the People's Republic of China (PRC). However, due to the political turmoil in China at the time, Type 032 series was cancelled after only a single unit was completed.
Document 7: Russian submarine Nerpa (K-152): INS "Chakra" is a 8140 t Project 971 (or Project 518; NATO: "Akula"-class submarine ) nuclear-powered attack submarine. The construction of the Nerpa submarine was started in 1993, but was then suspended due to lack of funding. The Indian Navy sponsored the building and sea trials of the submarine provided it was given to the Indian Navy on lease for 10 years. It was launched as "K-152 Nerpa" in October 2008 and entered service with the Russian Navy in late 2009. The submarine was leased to the Indian Navy in 2011 after extensive trials, and was formally commissioned into service as INS "Chakra" II at a ceremony in Visakhapatnam on 4 April 2012. The INS "Chakra" joined the Eastern Naval Command at Visakhapatnam.
Document 8: 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 9: Boyan Slat: Boyan Slat (born 27 July 1994) is a Dutch inventor, entrepreneur and Aerospace Engineering student drop-out. He was born to Croatian immigrants from Istra.
Document 10: Peter Diamandis: Peter H. Diamandis ( ; born May 20, 1961) is a Greek American engineer, physician, and entrepreneur best known for being the founder and chairman of the X Prize Foundation, the co-founder and executive chairman of Singularity University and the co-author of "The New York Times" bestsellers " and ." He is also the former CEO and co-founder of the Zero Gravity Corporation, the co-founder and vice chairman of Space Adventures Ltd., the founder and chairman of the Rocket Racing League, the co-founder of the International Space University, the co-founder of Planetary Resources, founder of Students for the Exploration and Development of Space, and vice-chairman and co-founder of Human Longevity, Inc.
Document 11: 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 12: Rocket Madsen Space Lab: Rocket Madsen Space Lab (often called RML Spacelab) was a laboratory established by Peter Madsen on 16 July 2014 in Copenhagen, after he left Copenhagen Suborbitals.
Document 13: 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 14: Peter Kamnitzer: Peter Kamnitzer (1921–1998) was a German-born American architect. Born in Germany, he emigrated first to Israel and secondly to the United States, where he settled in Los Angeles, California. He was a Professor of Architecture at the University of California, Los Angeles (UCLA). With NASA and General Electric, he invented a graphic design tool used to predict what impact buildings would have on environments. He was a proponent of adding greenery and leisurely facilities to apartment complexes. He designed many residential buildings in Downtown Los Angeles, including public housing.
Document 15: 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 .
ground_truth: 12.6 meters