INS Arighaat: Nuclear Triad Deterrence & Key MCQs

INS Arighaat (SSBN 81) is India's second indigenous nuclear-powered ballistic missile submarine, following INS Arihant.

Initiated in the 1980s, the secretive ATV project brought together the Indian Navy, Bhabha Atomic Research Centre (BARC), and DRDO.

INS Arighaat was built at the Naval Ship Building Centre in Visakhapatnam and commissioned by Defence Minister Rajnath Singh on 29th August 2024.

A nuclear triad ensures a resilient, survivable second-strike capability even if land and air bases are destroyed in a pre-emptive enemy first strike.

Nuclear submarines generate oxygen and freshwater onboard, allowing them to stay hidden indefinitely and ensuring guaranteed nuclear retaliation.

The K-15 Sagarika is a two-stage solid-fueled submarine-launched missile capable of carrying nuclear warheads up to 750 km.

The K-4 missile gives Indian submarines standoff deterrent coverage deep into adversary territory while operating safely from secure home bastions in the Bay of Bengal.

BARC developed the 83 MWt compact naval pressurized water reactor using enriched uranium fuel, housed in a specialized containment hull.

Leased in 1988, INS Chakra gave Indian naval personnel foundational operational experience in naval nuclear reactor management.

The Akula-II class nuclear-powered attack submarine INS Chakra was leased for a 10-year period from 2012 to 2021 to train crew and escort strategic assets.

SSBNs maintain continuous at-sea nuclear deterrence, while SSNs provide fast-attack escort protection and hunter-killer capabilities.

The CCS sanctioned ₹40,000 crore to construct two 6,000-tonne indigenous nuclear-powered attack submarines at the Ship Building Centre in Visakhapatnam.

India pledges never to be the first to use nuclear weapons against any adversary, maintaining unshakeable retaliatory capability.

Civilian political leadership maintains strict, non-delegated negative and positive control over India's nuclear arsenal through the Prime Minister.

INS Kattabomman operates specialized ELF and VLF antenna arrays whose radio waves penetrate seawater down to extreme submarine depths.

The VLF station at Damagundam provides redundant, fail-safe communication links to submerged submarines operating in deep blue waters.

The six Kalvari-class submarines (Kalvari, Khanderi, Karanj, Vela, Vagir, and Vagsheer) are stealth diesel-electric attack submarines.

INS Vagsheer was the culminating submarine of the initial six-boat Project-75 order, named after the sandfish predator of the deep ocean.

Fuel-cell AIP allows conventional submarines to generate electricity submerged without snorkeling for atmospheric air, extending submerged endurance from days to weeks.

Project-75I represents a major strategic partnership procurement to construct six state-of-the-art non-nuclear submarines with proven fuel-cell AIP.

Anechoic tiles absorb enemy sonar pings, while sound-isolated machinery rafts prevent mechanical vibrations from transmitting into the surrounding water.

With the commissioning of INS Arighaat alongside INS Arihant, India advanced significantly toward maintaining a continuous at-sea deterrent posture.

Code-named S4, INS Aridhaman has a displacement of approximately 7,000 tonnes and accommodates double the vertical missile launch tubes of INS Arihant.

The 533mm torpedo tube is the worldwide standard for firing heavy anti-ship and anti-submarine torpedoes (like Varunastra) and tube-launched Exocet missiles.

Varunastra travels at 40 knots with active-passive acoustic homing, capable of striking quiet stealth submarines up to 40 km away.

The Indian Navy operates two flyaway DSRV systems based in Mumbai and Visakhapatnam, featuring decompression chambers for submarine crew rescue.

Project Varsha at Rambilli provides fortified subterranean berths and pens for India's nuclear ballistic submarine fleet away from satellite surveillance.

SSKs utilize lead-acid or lithium-ion batteries coupled with diesel generators for quiet patrol and interdiction operations.

Because a nuclear reactor requires no oxygen for combustion, an SSBN's submerged range is constrained only by crew food and psychological stamina.

A secure sea-based deterrent validates India's credible minimum deterrence, ensuring no adversary can contemplate a disarming pre-emptive nuclear strike.