Yankee Notch refers to converted Project 667A submarines, especially Project 667AT, modified after ballistic missiles were removed under arms-control and force-structure changes. These conversions turned former SSBN hulls into attack or cruise-missile/special-purpose platforms. The designation reflects the visible hull changes from conversion rather than a new-build submarine class.
The Yankee Notch conversion removed or reworked the ballistic-missile compartment and adapted the hull for new mission equipment. Public references associate Project 667AT with cruise-missile or torpedo attack roles, while other Yankee conversions supported communications, test, or special missions. The key technical point is reuse: a strategic missile submarine hull was repurposed because its nuclear propulsion, volume, and endurance remained valuable.
Operationally, Yankee Notch boats illustrate how the Soviet Navy extracted value from older SSBN hulls after strategic missile roles changed. They could support attack, test, or special-purpose missions without building an entirely new nuclear submarine. Their importance is historical and structural: they show adaptation under treaty, budget, and fleet-modernization pressure rather than a frontline modern attack-submarine capability.
| Name | Country | Status | Service Year | Description |
|---|---|---|---|---|
INS Kalvari (S50) | 🇮🇳India | ACTIVE | 2017 – Present | Scorpene-class submarine India |
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