Project 77 — Nuclear Attack Submarine (SSN)

APPROVED

Planned indigenous SSN class for Indian Navy under long-horizon force development

Budget

Classified / programme estimate undisclosed

Timeline

2024–2040+

Sector

Indian Navy

Indigenisation

70%

PROCUREMENT TIMELINE

AON

CURRENT

Acceptance of Necessity — CCS/DAC approves the requirement.

RFI

RFP

ToC

CNC

Contract

Dev/Trial

Induction

INTEL SIGNALS

Budget classified — strategic program

Strategic priority designation

Open reporting indicates the CCS approved construction of the first 2 SSNs under Project 77 in October 2024, with a broader long-term SSN force plan beyond the initial tranche. Detailed technical and contractual breakdowns remain limited in public domain disclosures, so this entry remains conservative on timelines and subsystem specifics.

RECENT INTELLIGENCE

India’s S4* SSBN Hits Record 80% Indigenous Content, Paving the Way for Higher Localisation in S5 & Project-77 Subs - Defence.in

news.google.com · 31 Dec 2025

India’s $14 Billion Project-77: Nuclear Submarine Fleet to Dominate the Indian Ocean and Counter China’s Undersea Expansion - Defence Security Asia

news.google.com · 05 Oct 2025

New Visakhapatnam Dry Dock to Construct 10,000-Tonne Project-77 SSNs Alongside S5 Ballistic Missile Subs - Defence.in

news.google.com · 03 Feb 2026

CONTENDERS / VENDORS

Indian Navy · Ship Building Centre (Vizag) · L&T

LATEST UPDATES

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