OVERVIEW: The PLARB-667BDRM Delta IV [Delfin] is a nuclear-powered ballistic missile submarine (SSBN) of the Project 667BDRM design, entering service with the Soviet Navy in 1987. This class represents the fourth generation of Soviet SSBNs, designed to carry a new generation of submarine-launched ballistic missiles and featuring improvements in acoustic signature reduction compared to its predecessors.

DETAILS:
The Project 667BDRM Delfin (Delta IV) class was developed in the late 1970s and early 1980s at the Rubin Design Bureau as a successor to the Project 667BDR Kalmar (Delta III) class. The primary design goal was to create a quieter and more capable platform for the R-29RM Shtil' (SS-N-23 Skiff) SLBM, which offered improved range, payload, and accuracy over previous systems. The class incorporates significant acoustic dampening measures, including an improved hull design, rafted machinery mounts, and extensive use of sound-absorbing coatings. The Delta IV's operational service with the Soviet (and later Russian) Northern Fleet has been characterized by long-range patrols under the Arctic ice, providing a secure second-strike nuclear deterrent. The design was also intended to be more easily maintained and overhauled than earlier Soviet SSBNs, increasing overall availability.

The primary role of the Delta IV is strategic deterrence, achieved through the capability to launch its complement of SS-N-23 Skiff SLBMs from submerged locations within the Arctic Ocean. These missiles are capable of delivering multiple independently targetable reentry vehicles (MIRVs) to targets across a wide geographical area. Beyond its strategic role, the vessel also possesses a limited anti-submarine warfare (ASW) capability through its torpedo armament and sonar suite. The Shark Gill (MGK-520 Skat-BDRM) sonar system provides long-range detection and tracking of enemy submarines and surface vessels, while the Shark Tail (Pelmida) low-frequency towed array enhances detection capabilities, particularly in noisy environments. Snoop Tray 2 (MRK-50 Kaskad) is a radar system used for surface search and navigation.

The PLARB-667BDRM incorporates several sensors designed to enhance situational awareness and target acquisition. The Mouse Roar (MG-519 Arfa-M) is a mine detection and avoidance sonar. Brick Pulp (MRP-21 Zaliv-P) is an electronic warfare support measures (ESM) system, providing the capability to detect and analyze enemy radar emissions. The inclusion of both optical and low-light television (LLTV) periscopes provides visual observation capabilities, while an acoustic intercept system allows the submarine to passively monitor enemy communications and sonar activity. The 533mm torpedo tubes provide a self-defense capability against hostile submarines and surface ships, and the signal ejectors allow for the deployment of countermeasures and decoys.

SPECIFICATION: Length: 166.0 m || Beam: 12.3 m || Draft: 8.8 m || Disp: 13500 t

SENSORS: Shark Gill [MGK-520 Skat-BDRM] || Shark Tail [Pelmida] || Park Lamp || Brick Pulp [MRP-21 Zaliv-P] || Snoop Tray 2 [MRK-50 Kaskad] || Generic Acoustic Intercept || Mouse Roar [MG-519 Arfa-M] || Generic Submarine Periscope, Optical || Generic Submarine Periscope, LLTV

ARMAMENT: SS-N-23 Skiff SLBM || 533mm TT || 533mm TT || Signal Ejector