Key Highlights
- INS Kalvari, commissioned 2017, became the first Scorpene‑class design that proved India’s submarine ship‑building competence.
- INS Khanderi, inducted two years later, incorporated lessons from Kalvari to refine combat systems.
- Both vessels are 67 m, diesel‑electric, armed with Exocet anti‑ship missiles and torpedoes.
- Their hulls are built for acoustic stealth and equipped with advanced sonar suites, giving India a decisive sea‑denial advantage.
- Together they exemplify Project 75’s evolution from concept to fully autonomous indigenous production.
Detailed Insights
Design & Technology. The two submarines share a nearly identical architecture: diesel‑electric power, modular hull sections and a teardrop‑shaped hydrodynamic profile. The latest models feature enhanced acoustic dampening, better low‑frequency sonar arrays and integrated combat‑management systems upgraded from the first build.
Operational Role. Kalvari marked India’s first entry into modern submarine warfare, while Khanderi demonstrated operational maturity and the ability to sustain longer patrols with improved crew comfort and sensor reliability.
Strategic Significance. Their combined presence strengthens India’s sea‑denial posture in the Indian Ocean Region, limiting enemy surface and subsurface access and providing a deterrent against regional maritime challengers.
Cultural Locale. Kalvari’s name reflects a powerful tiger shark, whereas Khanderi’s designation recalls a historic Maratha fort, underscoring the navy’s linkage between heritage and modern technology.
Key Concepts
- Scorpene‑class submarine – a diesel‑electric attack platform designed for stealth, intelligence, surveillance and precision strike.
- Project 75 – joint Indian‑French program to build six advanced submarines for the Indian Navy.
- Diesel‑electric propulsion – combines diesel engines with electric motors for quieter operation.
- Sonar stealth – design features that reduce acoustic signatures to evade detection.
- Sea‑denial capability – the ability to prevent enemy vessels from operating in a specific maritime area.