Relevance: GS III (Defense & Security) | Source: The Indian Express

1. What is the news?

• The Big Launch: India has officially added its third nuclear-powered submarine, named INS Aridaman, to the Navy.
• Double Celebration: Along with it, a stealth warship named INS Taragiri also joined the fleet.
• Why it matters: For the first time ever, India now has three massive nuclear submarines actively guarding our deep oceans at the same time.

2. The ‘Made in India’ Submarine Family

These submarines belong to the Arihant class. Think of them as three brothers getting stronger with each generation:

• INS Arihant (2016): The first brother. Our very first nuclear submarine. It carries smaller missiles.
• INS Arighaat (2024): The second brother. Built with better technology and carries longer-range missiles.
• INS Aridaman (2026): The newest and biggest brother. It is much heavier, carries double the weapons (8 launch tubes instead of 4), and has an advanced engine to stay hidden underwater for a much longer time.

3. Know Your Submarines

Naval terms can be confusing. Here is the simplest way to remember them:

• SSBN (The Ultimate Weapon): It runs on nuclear power AND carries nuclear bombs. (INS Aridaman is an SSBN).
• SSN (The Hunter): It runs on nuclear power, but carries normal weapons (like regular torpedoes). Its main job is to secretly hunt enemy ships.
• Conventional (Diesel-Electric): Runs on normal diesel engines and batteries. Its biggest weakness is that it has to come up to the water surface frequently to get fresh air, making it easy for the enemy to spot.

4. Why is this Submarine so important?

To write a great essay or Mains answer, you must understand how this submarine protects India:

• The “Nuclear Triad”: This is a military term. It means a country has the power to fire a nuclear weapon from three places: Land (missiles), Air (fighter jets), and Sea (submarines). With Aridaman, India proves it is a superpower with a strong Triad.
• The Guarantee of a “Second-Strike”: India has a strict rule: We will never drop a nuclear bomb first. But what if an enemy attacks our land and air bases suddenly? That is where the submarine saves us. Because it is hiding deep in the dark ocean, it will survive the surprise attack. It will then rise and fire back with devastating force (Second-Strike). Because our enemies know this submarine is hiding out there, they are too scared to attack us in the first place.

5. Other Navy Plans

• Project-75I: India is currently working with Germany to build 6 new normal (conventional) submarines. These will have a special technology called AIP (Air-Independent Propulsion). AIP acts like an oxygen cylinder, allowing the submarine to stay underwater for weeks without coming up for fresh air.

The “UPSC Trap”

• The “First Attack” Trap: UPSC will try to trick you by saying, “India builds nuclear submarines so we can launch a surprise first attack on our enemies.” Incorrect. We strictly follow a “No First Use” policy. We build them only to survive and fight back if attacked (Second-Strike).
• The “SSN” Trap: A statement might say INS Aridaman is an SSN class submarine. Incorrect. It is an SSBN (it carries nuclear ballistic missiles).

UPSC Value Box

MCQ Practice Question

Q. With reference to the Indian Navy’s submarine fleet and strategic capabilities, consider the following statements:

1. INS Aridaman is a Ship Submersible Nuclear (SSN) class submarine designed primarily to carry conventional cruise missiles.
2. Submarines equipped with Air-Independent Propulsion (AIP) technology can remain submerged for significantly longer durations compared to traditional diesel-electric submarines.
3. The induction of SSBNs is essential to guaranteeing a “Second-Strike” capability under India’s official No First Use nuclear doctrine.

Which of the statements given above is/are correct?

• (a) 1 and 2 only
• (b) 2 and 3 only
• (c) 3 only
• (d) 1, 2 and 3

Correct Answer: (b)