**OVERVIEW:** The S 50 *Kalvari* [Scorpene] is a diesel-electric attack submarine (SSK) operated by the Indian Navy. The *Kalvari* class represents a significant modernization of India's submarine force, introducing advanced technologies and capabilities for a range of naval operations.

**DETAILS:**

The *Kalvari* class is based on the French Naval Group (formerly DCNS) Scorpene design, built under license by Mazagon Dock Limited (MDL) in Mumbai, India. The project, known as Project 75, aimed to indigenously construct advanced submarines, bolstering India's defense industrial base and reducing reliance on foreign suppliers. The design incorporates advanced stealth features, including an optimized hull shape and noise reduction techniques, making it a difficult target for opposing sonar systems. The *Kalvari* class is intended to replace older, less capable submarines in the Indian fleet. Commissioned in 2017, *Kalvari* represents the first of the class and a crucial step in modernizing India's underwater warfare capabilities.

The *Kalvari* class submarines are designed for a diverse range of missions, primarily anti-submarine warfare (ASW), anti-surface warfare (ASuW), intelligence gathering, and area denial. Its stealth characteristics and advanced sensor suite enable it to conduct covert operations in contested waters. The vessel is equipped to engage both surface ships and submarines, providing a potent offensive capability. Its endurance and range allow for extended deployments in the Indian Ocean and beyond. Furthermore, the submarine contributes to India's maritime domain awareness through its intelligence gathering capabilities, providing valuable information on potential threats and regional activities.

The *Kalvari* class boasts a modern sensor suite, enhancing its detection and targeting capabilities. The AR-900S radar provides surface search and navigation capabilities. The TRS 3110 Calypso IV, designated DRUA 33 within the Indian Navy, is a radar intercept electronic support measures (ESM) system, providing signals intelligence. The TSM 2233M Scylla sonar suite (Indian designation DSUV 2H bow sonar and DUUA 2D towed array sonar) provides long-range detection and tracking of underwater contacts. The TSM 2243 mine avoidance sonar system enhances safety in mine-threatened waters. The Series 30 SMS Photonics Mast replaces a traditional periscope, improving situational awareness and enabling operations in adverse weather conditions. The 533mm torpedo tubes allow for the launch of both anti-surface and anti-submarine torpedoes, while the C303/S DL is likely a decoy launcher to counter incoming torpedoes.

**SPECIFICATION:** Length: 70.0 m || Beam: 6.2 m || Draft: 5.8 m || Disp: 1870 t

**SENSORS:** AR-900S || TRS 3110 Calypso IV [DRUA 33] || TSM 2233M Scylla [DSUV 2H + DUUA 2D] || TSM 2243 || Series 30 SMS Photonics Mast

**ARMAMENT:** 533mm TT || C303/S DL