See also: Murder of Kim Wall and Peter Madsen § Murder of Kim Wall and sinking of UC3 Nautilus On 28 April 2017, Nautilus was launched again following repairs and upgrades. In January 2011, Nautilus returned to Refshaleøen to be taken on shore for upgrades, then expected to last several months. On Tuesday 31 August 2010, the submarine pushed the launch platform Sputnik, carrying the craft from Copenhagen towards the launch site near Nexø, Bornholm. One such expedition was the attempted launch of the rocket and spacecraft HEAT 1X Tycho Brahe, built by Madsen's non-profit organization Copenhagen Suborbitals. Nautilus was used by her builders and various others for recreation and expeditions. Video game developers from Ubisoft were also on board to find inspiration for their submarine game, Silent Hunter 5. On a 2009 trip around Refshaleøen, Nautilus was visited by a group of submarine fans from Subsim. The engine required a steady supply of air to operate, unlike the electric motor, and using it while submerged drops the air pressure to the equivalent of 3,000 m (9,800 ft) above sea level, as the engine ingests air from the crew compartment unless the snorkel is used. Nautilus could function on her diesel engine for up to eight minutes underwater without her snorkel. Nautilus submarine manual#However, as of July 2010, the engine crew still needed to perform manual changeover from surface to dive-ready configuration, setting valves correctly for snorkel and diesel engine exhaust. All controls and indicators were accessible from the captain's seat for controlling buoyancy, pumps, engines, air pressure, communication, video, and other electric systems. The submarine could be operated by a single person from the control room. In early 2009, an automatic snorkel system was installed so that the submarine could sail submerged on diesel power, and in August it sailed out from Køge submerged. Nautilus was much smaller than the Danish Kobben-class submarine at about two fifths the length, two fifths the width, and running at just above one third the speed. Joystick-controlled electric servos operated the rudder (aft) and hydroplanes (front). There were more than a tonne of large 12-volt batteries on board, supplying the DC electric motor which could be operated alone or in tandem with the main engine on a chain-coupled drive for turning the 80 kilogram, five-bladed brass propeller. Nautilus submarine generator#The other drove a three-phase electric generator providing power for the onboard air compressor and battery charger. The engine room had two diesel engines, one of which was for direct propulsion. The periscope had five video cameras, providing 360-degree panoramic vision on video screens in the forward control room. There were 16 portholes (8 on each side, 2 oversized) for direct observation. It could descend to periscope depth in approximately 20 seconds. The main ballast tanks of 8,000 litres (2,100 US gal) were filled and emptied with compressed air and could flush up to 400 litres (110 US gal) of water in/out per second. Trim was carried out normally with an electric pump, or with compressed air as fall-back if the trim-pump fails. It had two 1,500 litres (400 US gal) tanks for fresh water and fuel. The submarine moved at five to six knots, depending on conditions and whether it was submerged. Nautilus could be crewed by up to eight people for surface operation and four when diving.
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