The Musudan (Chosŏn'gŭl: 무수단;hancha: 舞水端) missile 무수단 미사일 , officially Rodong-B 노동B , Hwasong-10 화성10호, also known by the names BM-25, Taepodong X, Nodong / Rodong-B and Mirim, is a mobile intermediate-range ballistic missile developed by North Korea. The Musudan was first revealed to the international community in a military parade on 10 October 2010 celebrating the Korean Worker's Party's 65th anniversary, although experts believe these were mock-ups of the missile. The Musudan resembles the shape of the Soviet Union's R-27 Zyb submarine-launched missile, but is slightly longer. On Kim Il Sung's 104th Anniversary, North Korea celebrated by testing a missile and failed. South Korea believes it was the Musudan. The validity is currently unknown.