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Kalvari-Class Submarines Miss DRDO AIP Upgrade Due to Delays

4 August 20251 min read
DEFENCE & SECURITYKalvari-ClassSubmarines MissDRDO AIP UpgradeDue to Delays4 August 2025safalsetu.com

Why in the news

The plan to give the navy’s Kalvari-class conventional submarines longer submerged endurance hit another setback, since the home-grown AIP system from DRDO has not become operational.

Key facts

  • Submarine class involved: Kalvari-class, also called Scorpene, which are conventional boats.
  • Technology: the Air Independent Propulsion (AIP) system being built by DRDO.
  • Purpose: boost underwater endurance and stealth.
  • Status: the system is not yet working, so the retrofit has been delayed.

Significance

  • AIP is described as a key strategic capability for these submarines.
  • Until the DRDO system works, the retrofit cannot go ahead.

Exam angle

  • Full form: AIP = Air Independent Propulsion.
  • Developer of the indigenous AIP system: DRDO.
  • Submarine type to be retrofitted: Kalvari-class (Scorpene) conventional submarines.

Test yourself

1. Which organisation is developing the indigenous AIP system for the Kalvari-class submarines?

DRDO is developing the AIP system.

2. What does AIP stand for in the Kalvari-class submarine upgrade story?

AIP means Air Independent Propulsion.

3. The Kalvari-class submarines are also known by which name in the AIP delay notes?

Kalvari-class is also called Scorpene.