India secretly launches its third Arihant class submarine S4.

According to information published by News 18 on December 31, 2021, India has reportedly secretly launched its third Arihant class submarine, called S4, in Visakhapatnam.
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Arihant-class submarine INS Arihant (Picture source: Flickr)

The Arihant-class (Sanskrit, for Slayer of Enemies) is a class of Indian nuclear-powered ballistic missile submarines being built for the Indian Navy.

They were developed under the ₹90,000 crores (US$12 billion) Advanced Technology Vessel (ATV) project to design and build nuclear-powered submarines. These vessels are classified as "strategic strike nuclear submarines" by India.

They will be the first nuclear submarines designed and built by India. The submarines are 111 m (364 ft) long with a beam of 11 m (36 ft), a draught of 15 m (49 ft), displacement of 6,000 tonnes (5,900 long tons; 6,600 short tons).

The complement is about 95, including officers and sailors. The boats are powered by a single seven-blade propeller powered by an 83 MW pressurized water reactor and can achieve a maximum speed of 12–15 knots (22–28 km/h) when surfaced and 24 knots (44 km/h) when submerged.

The submarines have four launch tubes in their hump and can carry up to twelve K-15 Sagarika missiles with one warhead each (with a range of 750 km or 470 mi) or four K-4 missiles (with a range of 3,500 km or 2,200 mi).