OVERVIEW: The PLARK-667AT Yankee Notch [Grusha] is a Russian Federation Navy submarine, believed to be a highly modified variant of the Project 667AT (Yankee Notch) class. Entered service in 1992.

DETAILS: The Project 667AT Yankee Notch class was originally designed as a conversion of the Project 667A (Yankee I) SSBN, modified to carry cruise missiles in place of ballistic missiles. However, the 'Grusha', as this vessel is commonly referred to, deviates significantly from the original Yankee Notch configuration. Its development likely involved extensive upgrades to electronic warfare systems and sensor suites, potentially transforming it into a dedicated special operations or signals intelligence (SIGINT) platform. The Yankee Notch class as a whole reflects the Soviet, and subsequently Russian, emphasis on adapting existing platforms to new roles, driven by cost-effectiveness and technological advancements. This particular unit's late commission date and unique sensor suite suggests a significant modernization effort that surpasses the standard Yankee Notch refit. The submarine's design prioritizes stealth and long-range endurance to effectively conduct its missions in contested waters.

The primary role of the PLARK-667AT Yankee Notch [Grusha] is speculated to be intelligence gathering and special operations support, although anti-submarine warfare (ASW) capability is retained. While the standard Yankee Notch was initially focused on anti-shipping strike using cruise missiles, the 'Grusha' has undergone significant modifications that likely enhance its capabilities in covert operations. The acoustic intercept capabilities are particularly crucial for signals intelligence gathering, allowing for the passive monitoring of enemy naval communications. The presence of the Signal Ejector confirms a capability to deploy specialized communication buoys or other underwater payloads. The boat's four 533mm torpedo tubes provide a self-defense and offensive capability against surface and subsurface targets, and can launch a variety of torpedoes, including wake-homing variants, and potentially anti-submarine missiles via torpedo tubes.

The sensor suite aboard the 'Grusha' is extensive. The Shark Teeth [MKG-100 Kerch] and Shark Fin [MKG-100 Kerch] represent a comprehensive sonar system for both active and passive detection of underwater contacts. The Brick Pulp [MRP-21 Zaliv-P] radar provides surface search capabilities. Snoop Tray 2 [MRK-50 Kaskad] likely serves as an Electronic Support Measures (ESM) system, enabling the submarine to detect and analyze radar emissions from surface ships and aircraft. The Generic Mine & Obstacle Avoidance sonar aids in safe navigation in heavily mined or congested waters. The optical periscope allows for visual observation of the surface, providing valuable situational awareness. The installation of the Park Lamp indicates active sonar countermeasure capabilities, adding another layer of self-defense. These sensors, working in concert, provide a robust intelligence-gathering platform.

SPECIFICATION: Length: 141.5 m || Beam: 11.7 m || Draft: 7.9 m || Disp: 9000 t

SENSORS: Shark Teeth [MKG-100 Kerch] || Shark Fin [MKG-100 Kerch] || Park Lamp || Brick Pulp [MRP-21 Zaliv-P] || Snoop Tray 2 [MRK-50 Kaskad] || Generic Acoustic Intercept || Generic Mine & Obstacle Avoidance || Generic Submarine Periscope || Optical

ARMAMENT: 533mm TT || 533mm TT || 533mm TT || Signal Ejector