Commissioning of INS Aridhaman (S4)

Commissioning of INS Aridhaman (S4)

Source: TH

Context:

• The Indian Navy has officially commissioned INS Aridhaman, its third indigenously built Nuclear-Powered Ballistic Missile Submarine (SSBN).
• The Ceremony: Presided over by Union Defence Minister Rajnath Singh at the Shipbuilding Centre (SBC) in Visakhapatnam, Andhra Pradesh.
• Strategic Expansion: This follows the commissioning of INS Arihant (2016) and INS Arighaat (2024), strengthening India’s nuclear triad.
• Research Infrastructure: The Minister also laid the foundation stone for a Large Cavitation Tunnel (LCT), a critical facility for testing the stealth and hydrodynamic efficiency of future naval vessels.

UNDERSTANDING INS ARIDHAMAN (S4)

INS Aridhaman is a significant upgrade over the first two vessels in the Arihant-class, developed under the highly secretive Advanced Technology Vessel (ATV) project.

1. Enhanced Weaponry & Range

The “S4” variant is slightly larger and carries a more potent nuclear punch than its predecessors:

• Vertical Launch Tubes: Equipped with 8 tubes (double the capacity of the original INS Arihant).
• Missile Options:
  • K-4 SLBM: Can carry 8 of these intermediate-range missiles, capable of striking targets up to 3,500 km away.
  • K-15 (Sagarika): Alternatively, it can carry 24 of these short-range missiles with a 750 km reach.

2. Technical Superiority

• Indigenous Content: Approximately 70% of the submarine is built with Indian-made components and technology.
• Stealth: Nuclear-powered submarines can stay submerged for months (limited only by food supplies), making them the most “survivable” part of a nuclear deterrent because they are nearly impossible to track.

THE LARGE CAVITATION TUNNEL (LCT)

The foundation stone for the LCT is a major leap for indigenous naval design.

• What is Cavitation? It is the formation of vapor bubbles in water due to the high-speed movement of a propeller. When these bubbles collapse, they create noise and can damage the propeller.
• Why it matters: For a submarine, noise is the enemy. The LCT will allow Indian scientists to test scale models of propellers and hulls to ensure they are as silent and “stealthy” as possible before actual construction.