India has commissioned its third indigenously-built nuclear-powered ballistic missile submarine, ‘INS Aridhaman’, significantly bolstering the naval component of the nation's nuclear triad, authoritative sources said.

There is no official word yet on the commissioning of the platform that came amid a rapidly evolving regional security environment.

India's nuclear-powered ballistic missile submarine (SSBN) programme is a closely guarded project. ‘INS Arihant’ was the first underwater platform under the SSBN project that was followed by another one – ‘INS Arighat’.

INS Arihant is India's first home-made nuclear submarine. It was launched in July 2009 and was quietly commissioned in 2016. The Navy commissioned its second indigenous SSBN, INS Arighaat, in August 2024. The SSBN stands for ship submersible ballistic nuclear or nuclear-powered ballistic missile submarines.

The SSBN programme is a key element of India's nuclear deterrence capability.

The induction of INS Aridaman is seen as a major milestone to enhance India's strategic strike capabilities.

India is among a select group of countries that possess nuclear-powered submarines. The countries that have such assets are the US, Russia, the UK, France and China.

INS Aridhaman has been commissioned after months of sea trials. It is learnt that Defence Minister Rajnath Singh and Navy Chief Admiral Dinesh K Tripathi attended the commissioning ceremony held at a frontline naval base in southern India on April 03, 2026. 

Earlier on that day, Indian Navy's new warship ‘INS Taragiri’ was also commissioned in the presence of the Defence Minister at Visakhapatnam.

"It's not words but power, 'Aridhaman'," Singh said in a cryptic social media post in Hindi on Friday morning.

While India has proven air and land-launched nuclear capabilities, it is now looking at ramping up underwater nuclear prowess.

It is learnt that the focus will now be on a fourth nuclear-powered submarine. 

In December last year, Admiral Tripathi had confirmed that a new nuclear powered ballistic missile submarine will be commissioned into the service soon.

India has been a leading voice in pitching for universal nuclear disarmament aimed at complete elimination of atomic weapons.

In 1998, India conducted the Pokhran-II nuclear tests, triggering strong reactions from many countries.

Following the tests, India maintained that it carried out the tests to have 'credible minimum deterrence' and it will follow the approach of "no first use".

In 2003, India officially came out with its nuclear doctrine that clearly elaborated on the 'no first use' policy.

Earlier on that day, Indian Navy's new warship INS Taragiri was commissioned in the presence of Singh at Visakhapatnam.

In his address at the commissioning ceremony of stealth frigate INS Taragiri, Rajnath Singh described it as “not merely a warship but a symbol of India's growing technological prowess, self-reliance, and formidable naval power.”

"This ship is capable of high-speed transit and can remain deployed at sea for extended periods. It is equipped with systems designed to monitor enemy movements, ensure its own security, and if necessary, deliver an immediate response," he said.

"It features modern radar, sonar, and missile systems, such as BRAHMOS and surface-to-air missiles, which further augment its operational prowess," the Defence Minister added.