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Delta II (Project 667BD Murena-M)

Nuclear-Powered Ballistic Missile Submarine (1976)

Naval Warfare

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The Delta II-class boats were an outgrowth of the earlier Delta I model of nuclear-powered ballistic missile submarines serving the Soviet Navy during the Cold War years.

Authored By: Staff Writer | Last Edited: 06/22/2016 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.
The four Delta II (Project 667BD Murena-M) nuclear-powered ballistic missile submarines followed the earlier Delta I-class as something of an interim design. The boats were largely similar to the Delta I but had their hulls lengthened by 52.5 feet to accommodate an additional four missile tubes and increased their operating crew from 120 to 130 personnel. Displacement increased to 9,350 tons surfaced and 10,500 submerged. Dimensions included a running length of 508.5 feet, a beam of 39.3 feet, and a draught of 29.5 feet. Performance was slightly reduced when compared to the Delta I boats - surfaced speeds remained 12 knots but submerged speeds were 24 knots at most (from 25 knots). Diving depth improved from 390 meters to 450 meters and output power from the nuclear propulsion / steam machinery was raised to 55,000 horsepower from 52,000 horsepower.

Delta II boats were armed through 16 x D-9D launch tubes for the R-29D ballistic missile series. It retained the 4 x 533mm (21") forward-facing torpedo tubes at the bow and added 2 x 400mm torpedo tubes. Beyond the obvious physical changes to the series, Delta II submarines also introduced several noise-reducing features to help its presented acoustic levels - chiefly shock-absorbing struts at the steam turbines and a hydroacoustic coating on the hull.

Delta II boats were built at Severodvinsk from 1972 to 1975 and were themselves superseded by the newer Delta III-class in time. Decommissioning of Delta II-class boats began in 1996.


Service Year

Soviet Union national flag graphic
Soviet Union


Delta II-class

K-92; K-187; K-193; K-421

National flag of the Soviet Union Soviet Union
(OPERATORS list includes past, present, and future operators when applicable)
Submerged Attack
Traveling under the surface to search, track, and / or engage or reconnoiter areas.
Maritime Patrol
Active patroling of vital waterways and maritime areas; can also serve as local deterrence against airborne and seaborne threats.
Fleet Support
Serving in support (either firepower or material) of the main surface fleet in Blue Water environments.

508.5 ft
154.99 m
39.3 ft
11.98 m
29.5 ft
8.99 m

Installed Power: 2 x Pressurized water-cooled nuclear reactors with 2 x Steam turbines driving 55,000 horsepower to 2 x Shafts.
Surface Speed
12.0 kts
(13.8 mph)
Submerged Speed
24.0 kts
(27.6 mph)
Essentially Unlimited

kts = knots | mph = miles-per-hour | nm = nautical miles | mi = miles | km = kilometers

1 kts = 1.15 mph | 1 nm = 1.15 mi | 1 nm = 1.85 km
16 x D-9D ballistic missile launch tubes for R-29D missiles in dorsal compartment.
4 x 533mm (21") forward-facing torpedo tubes
2 x 400mm torpedo tubes

Supported Types

Graphical image of an aircraft aerial torpedo
Graphical image of a ballistic missile

(Not all weapon types may be represented in the showcase above)

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