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Things to know about INS Arighat:

1. The INS Arighat is "significantly more advanced" than its predecessor, INS Arihant, due to the indigenous technological advancements incorporated into it.
2. Both the INS Arihant and the INS Arighat are powered by 83 MW pressurized light-water nuclear reactors, enabling them to remain submerged for longer durations compared to conventional diesel-electric submarines, which need to surface regularly to charge their batteries.
3. Like its predecessor, the INS Arighat has four launch tubes in its hump. It can carry up to 12 K-15 Sagarika submarine-launched ballistic missiles (SLBMs), each with a range of 750 kilometres (km), or four K-4 SLBMs with a range of 3,500 km.
4. The INS Arighat, with a displacement of around 6,000 tonnes, is reportedly capable of achieving a maximum speed of 12-15 knots (22-28 km/h) on the surface and up to 24 knots (44 km/h) when submerged.
5. Although more advanced than its predecessor, the INS Arighat belongs to the Arihant class of submarines, with the name of the class derived from the Sanskrit term meaning 'Destroyer of the Enemy'.
6. The INS Arighat will complement the INS Arihant in enhancing India's nuclear triad, which refers to the ability to launch nuclear weapons from land, air, and sea.
7. Smaller than foreign counterparts: For instance, China operates six Jin-class submarines equipped with JL-3 missiles capable of reaching 10,000 km.

The third nuclear-powered INS Aridhaman, which is said to be bigger and more sophisticated and can weigh around 7,000 tonnes, is also under construction.

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