|Length:||7.8 m (26 ft)|
|Beam:||3.6 m (12 ft)|
|Draft:||3.0 m (9.8 ft)|
|Installed power:||9kW electric motor|
|Test depth:||6,000 m (20,000 ft)|
Mir (Russian: "Мир", world or peace) is a self-propelled Deep Submergence Vehicle. The project was initially developed by the USSR Academy of Sciences (now the Russian Academy of Sciences) along with Design Bureau Lazurith. Later two vehicles were ordered from Finland. The Mir 1 and Mir 2, delivered in 1987, were designed and built by the Finnish company Rauma-Repola's Oceanics subsidiary. The project was carried out under the supervision of constructors and engineers of the Shirshov Institute of Oceanology.
The vessels are designed to be used for scientific research. They might also be used to assist in submarine rescue operations, although they do not have the capacity to take anybody aboard when underwater. The carrier and command centre of both Mir submersibles is the R/V Akademik Mstislav Keldysh. Currently the two Mir units are operated by the Russian Academy of Sciences.
The MIR submersibles can dive to a maximum depth of 6,000 metres (19,685 ft). This makes them two of only seven manned submersibles in the world that can dive beyond 3,000 metres (9,843 ft), the others being the US submersibles Alvin, Sea Cliff and Deepstar 20000, the Japanese owned Shinkai and the French owned Nautile. Up to 98% of the world’s oceans are no deeper than 6,000 metres. All these deep-ocean submersibles utilize three-person crews.
Traditionally, the personnel sphere of a deep sea submersible is manufactured of titanium plates that are welded together. On Mir, the personnel sphere is made of a maraging steel alloy that has 10% better strength/weight ratio than titanium. This alloy contains about 30% cobalt and smaller amounts of nickel, chrome and titanium. Two hemispheres were made by casting and machining, and then bolted together, thus avoiding welded joints. The resulting construction is close to the density of water, thus making it easier to move in different depths. Additional buoyancy is provided by 8 cubic metres (280 cu ft) of syntactic foam. Unlike other Deep Submergence Vehicles that use iron ballast to reach the ocean floor, the buoyancy and depth is adjusted by ballast tanks.
- The Mir is 7.8 m long, 3.6 m wide, 3.0 m high, and weighs 18,600 kg (maximum payload is 290 kg). The personnel sphere's walls are 5 cm thick, and the inside diameter of the working area is 2.1 m. Three viewports are provided (viewport material is 18 cm thick): the forward-facing port is 20 cm diameter; the two side-facing ports are 12 cm diameter each.
- Power is provided by NiCad batteries of 100 kWh capacity. Electric motors drive hydraulic pumps to actuate hydraulic manipulators and 3 propulsors. The aft hydraulic propulsor is rated at 9 kW and 2 side propulsors are rated at 2.5 kW each. Maximum underwater speed is 5 knots.
- Longitudinal trim is controlled using 2 spherical water ballast tanks, fore and aft. Water can be forced out of these tanks as required by using compressed air.
- Air pressure inside the cabin remains at a constant one atmosphere: the air is recycled in a manner similar to that used on board spacecraft, with lithium hydroxide scrubbers removing accumulated carbon dioxide.
- VHF radio is used to maintain communication with the surface. The units contain imaging sonar units of 250 metre range, so nearby objects can be visualized and their distance measured. The distance to the seabed can also be accurately measured when nearing touchdown.
- The units' life-support systems have 246 man-hour capacity, or 3.42 days for a three-person crew.
- The units are designed for pressure at 6,000 metre depth, and have been tested to 125% of that pressure. In field testing, Mir-1 descended to 6,170 m and Mir-2 descended to 6,120 m.
- Originally the hydraulic manipulators were covered by a helmet-like retractable see-through visor, but these were removed in a major overhaul in 1994.
- Mir changes depth at a maximum vertical speed of 40 m per minute, so several hours are required to travel to and from deep sites.
Finnish-Soviet co-operation 
Production of the two MIR units was a prime example of Finnish-Soviet economic and technical co-operation during the Cold War. Bids from Canada, France and Sweden to construct the submarines had been retracted most likely due to political pressure. In a later interview with STT the then Rauma-Repola department head Peter Laxell said he believed that "Finland got the permit to deliver the crafts to the Soviets on the basis that the CoCom officials in the USA believed the project would be a failure . . . Once it became clear to them we actually had accomplished the engineering feat there was a huge uproar about how such technology could be sold to the Soviets, enough for many visits to the Pentagon.".
Because of the CoCom restrictions, most of the technology used had to be developed in Finland. The electronics was developed by Hollming. The syntactic foam was produced in Finland by Exel Oyj, as 3M, the leading producer, refused to supply their product.
The level of technology flowing into the Soviet Union raised concern in the USA and Rauma-Repola was privately threatened with economic sanctions. For example, one concern of the Pentagon was the possibility that the Soviet Union would manufacture a pioneer submarine fleet that could clear the ocean floor of U.S. deep sea listening equipment. With the possibility of losing its lucrative offshore oil platforms market Rauma-Repola yielded, and submarine development ceased in Finland. One project that was abandoned was the development of a fuel cell based air-independent propulsion system.
Titanic and Bismarck filming 
In the mid 1990s and early 2000s, the MIR vehicles were used by Canadian film director James Cameron to film the wreck of the RMS Titanic, resting at a depth of 3,821 metres, for his 1997 film Titanic and documentaries such as Ghosts of the Abyss, and to film the wreck of the Bismarck, resting at a depth of 4,700 metres, for his 2002 documentary film Expedition: Bismarck.
2007 North Pole submersion 
On August 2, 2007 Russia used the MIR submersibles to perform the first manned descent to the seabed under the Geographic North Pole, to a depth of 4,261 m, to scientifically research the region in relation to the 2001 Russian territorial claim. The Mir-1 crew: pilot Anatoly Sagalevich; polar explorer Arthur Chilingarov; and Vladimir Gruzdev. The MIR-2 crew were international: Russian pilot Yevgeny Chernyaev; Australian Mike McDowell; Swede Frederik Paulsen.
On the seabed Mir-1 planted a one meter tall rustproof Flag of Russia, made of titanium alloy at OKB "Fakel" in Kaliningrad, and left a time capsule, containing a message for future generations and a flag of United Russia. Soil and water samples of the seabed were taken during the mission.
Mistaken controversy 
A short time after announcement of the polar expedition, some newspapers tried to stir up controversy by claiming the expedition was fake because some of the footage was from James Cameron's movie Titanic. In fact, a Russian television network had used the Titanic footage (for which it holds the copyright) as an illustration of the deep-sea vessels in action. They had shown this hours before the Mirs had arrived on the Arctic seabed, and they had specifically pointed out that the footage was from the movie, not a transmission from the site. Reuters did not note this information when it carried the story, and used the pictures wrongly captioned. Reuters later apologized and issued a statement reading in part: Reuters mistakenly identified this file footage as originating from the Arctic, and not the North Atlantic where the footage was shot, and they reposted the story with correct captions.
2008-2009 Expedition to Lake Baikal 
In July 2008 both Mirs initiated a two-year expedition to Lake Baikal, the world's largest freshwater reservoir. The expedition is being led by the Russian Academy of Sciences. During the expedition around 160 descents are planned to the bottom of the lake, which is largely unexplored to this point. On the descent that occurred on August 1, Russian Prime Minister Putin accompanied the dive in the southern portion of the lake.
2011 Lake Geneva exploration 
In summer 2011, both Mirs are conducting a scientific exploration program in Lake Geneva called elemo (exploration des eaux lémaniques), in which researchers are conducting studies in areas such as bacteriology and micropollutants, as well as exploring Lake Geneva's geology and physics. The submersibles arrived on Lake Geneva in May 2011.
Notable pilots 
See also 
- Metallitekniikka 22.10.2003, re-published 5.12.2008: CIA tuhosi Rauma-Repolan parhaan bisneksen (Finnish), English summary in Helsingin Sanomat 22.10.2003
- Deep Ocean Expeditions website, accessed 14 Dec. 2008
- Helsingin Sanomat / STT 02.08.2007  "MIR - Suomalainen saavutus ja kylmän sodan pelinappula." Article name translates to: "MIR - A Finnish accomplishment and piece in the cold-war game"
- "Information on RV Akademik Mstislav Keldysh". Federal Target Program World Ocean (in Russian).
- (Russian) Russia submarines successfully end 1st travel to Arctic floor, ITAR-TASS, August 2, 2007
- (Russian) http://www.rg.ru/2007/08/03/arktika1.html
- (Russian) Arctic Triumph of Chilingarov Expedition at the website of United Russia
- Reuters gets that sinking feeling. MediaGuardian August 10, 2007 
- Reposted Reuters story with correct captions
- Глубоководные исследовательские аппараты "Мир‑1" и "Мир‑2". Справка, RIA Novosti, 24 July 2008 
- "Putin dives to bottom of world's deepest lake". AFP (Breitbart). 1 August 2009. Retrieved 2 August 2009.
- "Researchers to Explore Lake Geneva in Submersibles" (PDF). elemo. Retrieved July 4, 2011.
- "Russische U-Boote im Genfersee" (in German). Polarnews. June 30, 2011. Retrieved July 4, 2011.
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