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GS3 · Defence R&D

Large Cavitation Tunnel at NSTL Visakhapatnam

1 min readDefence Technology
Battle IAS current affairs title card: Large Cavitation Tunnel at NSTL Visakhapatnam (GS3 · Defence R&D, 3 April 2026)

What happened

  • The Defence Minister laid the foundation stone of a Large Cavitation Tunnel at DRDO’s NSTL, Visakhapatnam, for naval research and testing [PIB].

Background

  • Cavitation tunnels test propellers and hull forms for noise and efficiency, vital for submarines.

Why it matters

  • A cavitation tunnel helps design quieter submarines and ships, which is what stealth at sea means.

How to use this in Mains

GS-III Security; indigenisation of technology

  1. As per PIB (2026-04-03): the Defence Minister laid the foundation stone of a Large Cavitation Tunnel at DRDO's NSTL, Visakhapatnam, for naval research and testing.
  2. A cavitation tunnel helps design quieter submarines and ships, which is what stealth at sea means.
Quotable data point

The Defence Minister laid the foundation stone of a Large Cavitation Tunnel at DRDO's NSTL, Visakhapatnam, for naval research and testing.

PIB: Defence: NSTL tunnel, 3 Apr 2026

Exam angle

UPSC

Prelims: NSTL.

Practice MCQs

Original practice questions (not PYQs).

Practice · UPSC

Lab

Answer (a) & explanation

PIB.

Practice · UPSC

City

Answer (a) & explanation

PIB.

Practice · UPSC

Tests mainly

Answer (a) & explanation

PIB.

Official source: PIB: Defence: NSTL tunnel, 3 Apr 2026

facts from cited sources only; faculty review pending