I have added several extra hyperlinks, comments in [ ] brackets and a photo (particularly concerning the suspected missiles, Golf and SINPO-class submarines) relevant to the following article.
That article is by Sean Gallagher at arstechnica published May 12, 2015 concerning North Korea's alleged submarine launch of a ballistic missile. The submarine and missile details will need to be fully verified by intelligence agencies before they are taken as fact.
Kim Jong-un watches as North Korea's navy successfully test-launches a ballistic missile from a submarine on May 9.
On May 9, a Korean People's Army Naval Force submarine test-launched a ballistic missile off the eastern coast of North Korea. The test launch, reported by North Korea's Rodong Sinmun newspaper, only traveled about 150 meters, according to South Korean defense officials. But it demonstrated that North Korea had developed the capability of performing submerged launches of missiles well ahead of previous intelligence estimates. Based on the launch, South Korean officials now believe that North Korea could have a limited submarine-launched missile capability deployed to its fleet of submarines within the next five years.
The test comes as South Korea nears a decision on the deployment of a Terminal High Altitude Area Defense (THAAD) anti-ballistic missile system. China has been pressuring South Korea to not allow the deployment, but an earlier, barge-based test of the submarine-launchable missile (named "Polaris-1" by North Korea) on April 22 has made the deployment more likely.
North Korean press images of Kim Jong-un's successful supervision of the "Polaris-1" launch.
Polaris-1 [possibly a BM25-Musudan] [possibly also called "KN-11" or "KN-02"] is apparently a close copy of a Soviet-era R-27 ...SLBM...liquid-fuel SS-N-6 "Serb." This is the third test launch of the missile this year, but it is the first [possibly] submarine launch. Developed in apparent violation of a UN resolution banning North Korean ballistic missile development, the missile could have a range of about 1,500 miles.
The original R-27 was capable of carrying three independent nuclear warheads. An explosion of an R-27 missile caused by a reaction between a seawater leak and fuel residue aboard the Soviet "Yankee" class ballistic missile sub K-219 in 1986 off of Bermuda led to one of the most tense moments in the late Cold War (later breathlessly and inaccurately recounted in one of the worst submarine movies ever, Hostile Waters).
North Korean leader Kim Jong-un, who had previously planned to travel to Russia over the weekend but then cancelled his plans last week, was on hand to observe the launch. "He stressed that the acquisition of the technology of firing ballistic missile from a strategic submarine underwater made it possible for the KPA to possess a world-level strategic weapon capable of striking and wiping out in any waters the hostile forces infringing upon the sovereignty and dignity of Songun Korea and conduct any underwater operation," reported the Korean Central News Agency, North Korea's government news service.
Almost all of North Korea's existing submarine fleet is made up of diesel-electric submarines with limited range, including about 20 based on the 1950s Soviet Project 633 ("Romeo") design imported from China or locally built. [North Korea reportedlyoperates 22 (or 20) Romeo class submarines. Seven were directly imported from China between 1973 and 1975, and the remainder locally assembled with Chinese supplied parts between 1976 and 1995. One apparently sank in an accident in 1985. Four Chinese imported units are based on North Korea’s western coast.]
[North Korea's new "SINPO class" submarine(also see) considered capable of launching up to 3 SLBMs - Photo Courtesy http://38north.org/2015/01/jbermudez010815/. 38north wonders "Exactly what missile system would be used in a ballistic missile submarine (SSB) is purely speculative at this point. Several possibilities are a shorter naval version of the Musudan intermediate-range ballistic missile, a Nodong medium-range ballistic missile, naval versions of the solid-fuelled KN-02 short-range ballistic missile or an entirely new system."
Wiki contributors wonder whether the SINPO's design may be derived from old Yugoslav Heroj and Savasmall sub designs [1] and/or from medium sized Soviet/Russian Kilo class, or Golf class designs. Wiki also estimated SINPO's weight as "1,000-1,500 tons", length "65.5 meters" and range "1,500 nautical miles". It is difficult to know whether SINPO is diesel-electric or only has a battery (just electric)]
The Golf-II class [Fourteen Golf Is were extensively modified in 1966–1972 to carry larger, longer range missiles, becoming known as 629A's by the Soviet Navy and Golf IIs by NATO.] carried the R-27 missile toward the end of its active duty in the Soviet Navy and had an operational range of 9,500 nautical miles (about 11,000 miles). They were capable of 17 knots (about 20 mph) when running on the surface and 12 knots (about 14 mph) when submerged. So in theory, a North Korean Golf-II submarine could get in range of the United States for a launch, but it would require being at sea for two to three months to get close enough to strike, transiting a lot of open ocean. The Korean Peoples' Army Navy is mostly a coastal force with no deep-water experience, and diesel subs transiting the Pacific would be easy targets for US sensors and patrols.
The bigger concern is that these subs could evade detection in Korean coastal waters and launch attacks against South Korea and Japan with little warning. Jeffrey Lewis of the California-based Monterey Institute of International Studies told Reuters, "While North Korea's submarines are not especially effective, the challenge of finding even a small number of specific submarines armed with missiles would be quite a challenge.""
