INS Vagir is expected to be commissioned in 2022, after completing its sea trials.

INS Vagir has been successfully launched

Indian media reported that the Indian Navy has successfully launched the INS Vagir, the fifth submarine of the first batch of six Kalvari-class submarines, built by Mazagon Dock Limited, an Indian shipyard in Mumbai, Maharashtra.

Before that, two submarines Kalvari and Khanderi have been commissioned in 2017 and 2019. The 3rd and 4th, Karanj and Vela are in the sea trials, while the sixth one, the Vagsheer, is ready to be assembled.

INS Vagir is expected to be commissioned in 2022, after completing its sea trials.

INS Vagir Submarine
INS Vagir Submarine

The origin of the Kalvari class of submarines

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.

INS Vagir is named after a deep sea killer predator in the Indian Ocean. The first Russian-made Vagir submarine was commissioned into the Indian Navy in 1973 and decommissioned in 2001.

Shipbuilder Mazagon Dock said building the Kalvari class submarines was a challenge, and the simplest things also became complicated, as everything was done in tight spaces.

The design of INS Vagir

Designed to be a predatory assassin, the INS Vagir’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 Vagir has a length of 67.5 m (221 ft), height of 12.3 m (40 ft), overall beam of 6.2 m (20 ft) and a draught of 5.8 m (19 ft). The submarine displaces 1,615 t (1,780 short tons) when surfaced and 1,775 t (1,957 short tons) when submerged.

Propulsion of INS Vagir Submarine

INS Vagir 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 kn (37 km/h) when submerged and a maximum speed of 11 kn (20 km/h) when surfaced. The submarine has a range of 6,500 nmi (12,000 km) at 8 kn (15 km/h) 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 Vagir 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 Vagir 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.

Strategic implications of the Kalvari class submarines

The successful launch of the fifth Kalvari class submarine is a milestone for India’s defense industries. The completion of the new submarines has been accelerated in recent times, instead of delays like the first ones.

With the fifth submarine, the INS Vagir, the Indian Navy is about to have a powerful new submarine fleet. These submarines will gradually replace the obsolete Indian submarines. One of the main missions of the new submarines will undoubtedly be monitoring the increase in the Chinese navy’s presence in the Indian Ocean.

The six Kalvari class submarines are just the beginning of India’s ambitious plan to upgrade its undersea forces. The Indian Navy plans to have at least 18 conventionally powered submarines in the Indian Ocean, along with six nuclear-powered attack submarines, and four nuclear-powered ballistic missile submarines.

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