Introduction

INS Arihant is India’s nuclear-powered ballistic missile submarine. It is a key strategic platform in India’s defence system and forms the sea-based leg of India’s nuclear triad. Its induction marked a major milestone in India’s nuclear deterrence capability.

Nature of Platform

• Nuclear-powered ballistic missile submarine
• Classified under the SSBN category
• Designed for strategic deterrence and nuclear retaliation
• Part of India’s sea-based nuclear capability

Meaning of SSBN

SSBN is the hull classification used for nuclear-powered submarines equipped with ballistic missiles.

It stands for:

• Nuclear-powered submarine
• Ballistic missile carrying submarine

Such submarines are important because they can remain underwater for long durations and provide survivable deterrence.

Commissioning

• INS Arihant was commissioned in 2016

Its commissioning represented a major step in India’s strategic weapons programme.

Strategic Importance

The ability to launch nuclear weapons from submarines is of great strategic value. It strengthens India’s nuclear deterrence, especially under the No First Use policy, because it ensures second-strike capability even if land-based assets are attacked.

Its importance lies in:

• Completing India’s nuclear triad
• Strengthening second-strike capability
• Providing credible sea-based deterrence
• Enhancing survivability of nuclear forces

Missile Capability

INS Arihant has been associated with submarine-launched ballistic missiles from the K-family.

Important missile linked with it:

• K-15 Sagarika with a range of about 750 km

The Arihant-class programme is also linked with the development of longer-range missiles such as K-4.

K-family Missiles

The family of indigenously developed submarine-launched ballistic missiles is known as the K-family. These missiles are named after Dr A P J Abdul Kalam.

Important missiles in this family include:

• K-15 Sagarika – range about 750 km
• K-4 – range about 3,500 km

Operational Control

• Operations of submarine-launched ballistic missiles from SSBNs come under the Strategic Forces Command
• Strategic Forces Command is a part of India’s Nuclear Command Authority

This reflects the centralized command and control structure of India’s nuclear weapons system.

INS Arighat

• INS Arighat is the next submarine in the Arihant class
• It followed INS Arihant in India’s SSBN programme

It represents the continuation of India’s indigenous sea-based nuclear deterrence effort.

Significance for India

INS Arihant is important because:

• It gives India a secure underwater nuclear platform
• It supports assured retaliation
• It strengthens India’s strategic autonomy
• It places India among a limited number of countries with indigenous SSBN capability

Key Facts for Prelims

• INS Arihant is a nuclear-powered ballistic missile submarine
• It is classified as an SSBN
• It was commissioned in 2016
• It is associated with K-15 submarine-launched ballistic missile
• It is part of India’s nuclear triad
• Its missile operations fall under Strategic Forces Command

Conclusion

INS Arihant is one of the most important strategic assets developed by India. It represents the sea-based leg of the nuclear triad and significantly improves India’s second-strike capability under its nuclear doctrine.