On 20 April 2022, INS Vagsheer S26, the sixth submarine of the  Kalvari-class of the Indian Navy, was launched.

The submarine has been named after the INS Vagsheer S43, a Vela-class submarine of the Indian Navy which was in service from 1974 to 1997. After launch, submarine INS Vagsheer will undergo a comprehensive and rigorous set of tests and trials for more than a year to ensure that it is fully combat-ready.

The Kalvari-class is a class of diesel-electric attack submarines based on the French Scorpène-class submarines designed by the French naval defence and energy company DCNS. Kalvari class submarines are built in India, under Project 75 of the Indian Navy. Kalvari-class submarines were built to engage in anti-surface ships, submarines, intelligence gathering, mine laying and area surveillance.

Designed to be a predatory assassin, the INS Vagsheer’s goal is to target and sink enemy naval ships. Modern technology used in this submarine ensures high stealth features such as sound absorption, low noise, and hydrodynamic shape. It is capable of striking enemies with precision-guided weapons.

The hull, fin and hydroplanes are designed for minimum underwater resistance and all equipment inside the pressure hull is mounted on shock absorbing cradles for enhanced stealth. Special steel was used in its construction which has high tensile strength, capable of withstanding high yield stress and hydro-static force.

When completed, INS Vagsheer has a length of 67.5 m, height of 12.3 m, overall beam of 6.2 m, and a draught of 5.8 m. The submarine displaces 1,615 tons when surfaced and 1,775 tons when submerged.

INS Vagsheer is powered by four MTU 12V 396 SE84 diesel engines, has 360 battery cells, for power and has a silent Permanently Magnetised Propulsion Motor. It can reach a top speed of 20 knots when submerged, and a maximum speed of 11 knots when surfaced. The submarine has a range of 6,500 nmi at 8 knots when surfaced.

The Kalvari class submarines are capable of launching various types of torpedoes and missiles, and are equipped with a range of surveillance and intelligence gathering mechanisms. INS Vagsheer is equipped with six 533-mm torpedo tubes for a combination of 18 heavyweight wire-guided German-made Surface and Underwater Target torpedoes, and SM39 Exocet anti-ship missiles or 30 mines in place of both.

INS Vagsheer is also fitted with mobile C303/S anti-torpedo decoys for self-defence. The weapon systems and sensors are integrated with Submarine Tactical Integrated Combat System. It has a sonar system is capable of Low Frequency Analysis and Ranging enabling long range detection and classification. The submarine has a complement of 8 officers and 35 sailors.

Six submarines were built by MDL under Project 75, under technology transfer from the Naval Group under a $3.75 bn deal signed in October 2005. The first one, INS  Kalvari, was commissioned in December 2017.

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