The Delta III-class submarine is the NATO reporting name for the Soviet Project 667BDR Kalmar, a Sevmash-built nuclear-powered ballistic missile submarine designed around the D-9R launch system and 16 R-29R / SS-N-18 submarine-launched ballistic missiles. The class introduced a MIRV-capable Soviet SSBN design, remained visible in Russian Pacific Fleet strategic exercises into the 2010s, and ended regular SSBN service when K-44 Ryazan was withdrawn after the other Project 667BDR boats had already left service.
Russian Strategic Nuclear Forces reported that K-44 Ryazan, a Project 667BDR / Delta III submarine, took part in a 2019 strategic forces exercise and launched its missile from the Sea of Okhotsk to the Chizha test site, but the open-source record does not tie the class to a specific named conflict.
The Delta III design centered on the R-29R / SS-N-18 missile and the D-9R launch system rather than conventional naval strike. Public sources describe a 16-missile load, MIRV-capable R-29R variants, and strategic test launches from Pacific Fleet boats long after most of the class had aged out of front-line service.
Sixteen R-29R / SS-N-18 SLBMs in the D-9R launch system.
FAS and CSIS identify Delta III / Kalmar as the R-29R carriage platform.
FAS describes the class as the first Soviet submarine able to fire any number of missiles in one salvo.
The feature is treated here as design context, not combat use.
K-44 Ryazan was reported withdrawn after serving as the last regular Delta III SSBN.
Open sources do not tie the class to a specific named armed conflict.
Delta III-class submarines were strategic missile carriers built around the D-9R launch system and R-29R / SS-N-18 missile family.
| Carried item | Item type | Carriage evidence |
|---|---|---|
 | Submarine-launched ballistic missile | FAS and CSIS identify Project 667BDR / Delta III as carrying 16 R-29R / SS-N-18 missiles; a dedicated R-29R catalog record is not yet available, so this link points to the broader ballistic-missile class. Sources: 667BDR DELTA III - Russian and Soviet Nuclear Forces, R-29 Vysota (SS-N-18) | Missile Threat, R-29R/R-2S / SS-N-18 STINGRAY |
Delta III-class submarines are documented with the 53-65K and 53-65M among their 533 mm torpedoes.
| Ammunition | Ammunition type | Firing evidence |
|---|---|---|
 | 533 mm wake-homing torpedo | The class source lists the 53-65K among the torpedoes carried in its four 533 mm tubes. |
 | 533 mm wake-homing torpedo | The class source lists the 53-65M among the torpedoes carried in its four 533 mm tubes. |
FAS says development of the 667BDR Delta III began at the Rubin Central Design Bureau for Marine Engineering in 1972.
Sources: 667BDR DELTA III - Russian and Soviet Nuclear Forces
FAS says the advanced Delta III SSBN entered service in 1976, and by 1982 a total of fourteen submarines had been commissioned.
Sources: 667BDR DELTA III - Russian and Soviet Nuclear Forces
Russian Strategic Nuclear Forces reported that K-223 Podolsk, a Project 667BDR / Delta III boat, launched an R-29R missile from the Sea of Okhotsk to Chizha during a Russian command-and-control exercise.
Sources: Multiple missile launches during a command and control exercise
Russian Strategic Nuclear Forces reported another strategic command-and-control exercise in which K-223 Podolsk launched an R-29R from the Sea of Okhotsk.
Sources: Russia tests command and control system in an exercise with multiple missile launches
Russian Strategic Nuclear Forces and NTI describe Podolsk and Svyatoy Georgiy Pobedonosets leaving service in early 2018, leaving K-44 Ryazan as the only operational Project 667BDR / Delta III SSBN.
Sources: Two Project 667BDR submarines withdrawn from service, Russia Submarine Capabilities
Russian Strategic Nuclear Forces reported that K-44 Ryazan, described as the last Delta III in service, had been withdrawn after its 2019 strategic-exercise missile launch.
Sources: Ryazan, a Project 667BDR/Delta III submarine withdrawn from service
