page_title: Delta-class submarine
section_title: Delta II (Project 667BD Murena-M) 4 boats
hierarchical_section_title: Delta-class submarine / Delta II (Project 667BD Murena-M) 4 boats
context_page_description: The Delta class, Soviet designations Project 667B Murena, Project 667BD Murena-M, Project 667BDR Kalmar, Project 667BDRM Delfin, are a series of nuclear-powered ballistic missile submarines, designed and built in the Soviet Union, which formed the backbone of the Soviet and Russian strategic submarine fleet since their introduction in 1973. They carry nuclear ballistic missiles of the R-29 Vysota family, with the Delta I, Delta II, Delta III and Delta IV classes carrying the R-29, R-29D, R-29R and R-29RM respectively. The Delta I class carried 12 missiles, while the Delta II class which are lengthened versions of the Delta I class carry 16 missiles. The Delta III and Delta IV classes carry 16 missiles with multiple warheads and have improved electronics and noise reduction.
  The R-27 Zyb missile carried by the Yankee-class submarines of the late 1960s had a range of 2,500–3,000 km, so the earlier submarines were forced to patrol close to the North American coast, whereas the Deltas could launch the over 7,700 km-range R-29s from the relative safety of the Arctic Ocean. In turn the Deltas were superseded by the larger Typhoon-class submarines.
context_section_description: The Delta II-class submarine was a large ballistic missile submarine designed to remedy shortcomings in the Delta I-class submarine. The design was essentially the same, however the submarine was lengthened in the fourth and fifth compartments by 16 meters (52 ft) to allow the installation of four more missile tubes. The new type of Delta also received additional quieting measures including having the steam turbines mounted on shock absorbers, having all pipes and hydraulics separated from the hull through rubber insulation, and a special hydroacoustic coating being applied to the hull.
  The NATO reporting name, Delta II indicates this submarine as a visually distinguishable new class. The Soviet designation, 667BD Murena-M indicates this submarine is an improved Delta I.
  Only four submarines of this class were built, apparently in favor of building the following class, the Delta III, and all Delta IIs were out of service by 1996.
caption: A Delta II-class submarine