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. 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. JSTOR ( April 2018) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources in this section. This section needs additional citations for verification. In October 2008, Nautilus was submerged for the first time. The objective was to sail Nautilus and evaluate her maneuverability, and the appraisal was favourable. On its maiden voyage, the submarine was driven by former crewmen of the now-defunct Royal Danish Navy submarine division. By August 2008, Nautilus could sail on its own, as the main diesel engine drive train and steering was completed. It was named at a well-attended ceremony on the west side of Refshaleøen and towed to the floating installation art barge Illutron (formerly M/S Half Machine) in the Kongens Enghave, where further outfitting and installation of equipment took place over the next several months. On the day of its launch on, UC3 Nautilus displaced only 32 tons and was still incomplete. As part of the conviction of Madsen for Wall's murder, the submarine was confiscated and later destroyed by the authorities. The following day, Danish police had the submarine salvaged and brought onto land as part of the investigation of the death of Swedish journalist Kim Wall, who was last seen alive on board. On 11 August 2017, Nautilus sank in the bay of Køge, in what investigators determined was a deliberate act. The submarine was Madsen's third submarine design. It was built over a three-year period by Peter Madsen and a group of volunteers, and cost approximately US$200,000 to build (1.5 million DKK). UC3 Nautilus was a privately built Danish midget submarine.
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