India has successfully conducted a test of its nuclear-capable K-4 submarine-launched ballistic missile (SLBM), fired from the nuclear-powered submarine INS Arighaat in the Bay of Bengal. The K-4 missile, with a strike range of approximately 3,500 km, marks a major milestone in India’s sea-based nuclear deterrence and reinforces its nuclear triad-land, air, and sea-based capabilities.

India Conducts Nuclear Missile Test: K-4 Roars from Sea to Sky

Submarine-launched ballistic missiles are among the deadliest weapons because they guarantee a hidden second-strike capability. Stealthy submarines carrying MIRV missiles can strike with little warning, making first strikes futile and ensuring nuclear deterrence and strategic stability.


‘Submarine-launched missiles’: Why they are considered among the deadliest weapons

Pakistan has formalised an agreement with China for the acquisition of eight Hangor-class submarines, a cornerstone program in the modernization of the Pakistan Navy’s undersea warfare capabilities. The deal reflects a long-standing strategic and industrial partnership between the two countries and marks one of the most significant naval procurement efforts in Pakistan’s history.


Pakistan Navy: Fourth Hangor-class submarine hits the water in China

Ukraine’s security service, the SBU, says it has carried out a special operation against Russia’s navy, claiming an underwater drone struck a Russian Kilo-class submarine at the Black Sea port of Novorossiysk. The agency released video footage it says shows the moment of impact.

Russia has rejected the claim, denying any damage to its fleet and insisting no such strike occurred. The development comes as Western nations remain divided over military and financial support for Ukraine, highlighting growing fractures in international backing amid the ongoing war.


Ukraine Claim Hit On Russian Submarine In Black Sea Port 

ShipOS is designed to consolidate data from supply chains, production lines, engineering systems and maintenance workflows into a single interface. 

What is ShipOS? US Navy submarines to get AI boost from Palantir

India has concluded a $2-billion agreement with Russia to lease a nuclear-powered attack submarine. Public reports do not specify the vessel’s name or class. 

India-Russia Summit 2025: 7 ways a nuclear attack submarine enhances India's naval power

Officials clarified that the submarine mentioned in speculative reports is the same platform covered under a 2019 lease agreement. 

Top 7 things about India-Russia's nuclear submarine agreement

USS Holland was first true military submarine commissioned October 12, 1900 by United States Navy. Purchased April 11, 1900 for $150,000. Designed by Irish-American John Philip Holland combining electric motors and gasoline engines. HMS Holland 1 launched on October 2, 1901. 

Which was the first submarine in the world, and when did it enter service?

South Korea's government has announced that it has finalised an agreement to build nuclear-powered submarines in partnership with the United States. The US has approved the "attack submarines" and agreed to cooperate in sourcing fuel, according to a fact sheet released by the White House 

North Korea says Seoul-US submarine deal to trigger 'nuclear domino' effect

A new report reveals how Russia quietly integrated Western technology into its nuclear submarine fleet enhancing the stealth, endurance, and survivability of the world’s most powerful underwater weapons.

How Western Tech Reinforced Russian Submarines

In a historic first, China has publicly unveiled its complete nuclear triad—land-based missiles, submarine-launched missiles, and strategic bombers—during a massive military parade. The unprecedented display signals Beijing’s growing strategic confidence and sends a clear message to global rivals, including the United States.

China military parade: New gen tech, AI-equipped drones on display

Russia and China have conducted a joint submarine drill, showcasing deepening military cooperation and strategic alignment. The exercise highlights both nations' growing naval capabilities amid rising global tensions and signals a united front against Western influence in key maritime regions.

China-Russia launch joint submarine patrols | Britain's hunt for Russian super-sub

Russia and China flex military muscle: Hold submarine drill

The world’s best stealth submarines in 2025 blend nuclear or AIP tech, quiet operations, and strong weapons. From the USA’s Virginia to INS Arihant India and Japan’s Soryu, these seven subclasses are the front runners in undersea power and global naval balance.

Top 7 advanced stealth submarines patrolling globally

World | The investigation into the incident is underway to determine what caused the accident, Egyptian media reported. The report added that the injured were taken to nearby hospitals along with the bodies of people who died.

Six dead, several injured after tourist submarine sinks off Egypt’s Red Sea coast

The U.S. is building a submarine presence on the strategic Australian coast under AUKUS, the trilateral security partnership between Australia, the United Kingdom, and the United States. This effort involves basing U.S. nuclear-powered attack submarines outside of Western Australia. A U.S. nuclear submarine recently entered an Australian port, marking a significant development. This comes against the backdrop of China's recent live-fire exercises off Australia's coast.

Australia to buy 3 nuclear-powered US submarines under AUKUS

A newly released audio recording captures the exact moment the Titan submarine imploded, offering chilling insight into the tragic event. The sound was detected by a passive acoustic recorder over 1,400 km away. Experts continue to investigate the disaster. Implosion killed all five onboard Titan

Audio recording reveals moment of Titan submarine implosion disaster

American officials have confirmed that China's newest nuclear submarine sank in a dock. According to American officials the incident took place earlier this year between around May and June which came to light with the help of satellite images. Watch to know more.

China's Newest Nuclear Submarine Sinks in Shipyard

Stealthy Chinese Nuclear Submarine Sinks In Secret

China's Newest Nuclear-Powered Submarine Sinks

Canada's shoestring defence budget has neglected its submarine fleet for years. Now, it has an ambitious new plan to build more. The question is, can Canada operate and maintain more submarines? Boosting its maritime capabilities to meet the challenges of today, will require more than just new boats and subs. Has the NATO member made plans to sustain submarine operations?

Canada's Bold New Submarine Dream | Can Ottawa Step Up to Meet NATO's Defence Goals?

A commission investigating irregularities in a German submarine deal has warned several current and former Israeli officials, who may be adversely impacted by its findings, including Prime Minister Benjamin Netanyahu. Watch in for more details!

Netanyahu warned by Israeli inquiry commission over German submarine deal irregularities

Russia's defense ministry says, Russian nuclear-powered submarine Kazan and frigate admiral Gorshkov are practicing the use of high-precision weapons in the Atlantic ocean. The drills involve hitting targets from a distance of more than 600 km (370 miles), and follow an exercise in anti-aircraft fire. The Russian vessels are heading for Cuba for drills.

Russian warships hold drills in the Atlantic

#Gravitas | A team from the U.S. is currently in India to hold discussions on the acquisition of MQ-9B drones. On this edition of Gravitas deep dive, we talk about the history of UAVs and how the 'hunter-killer' drone variant came to be.

Gravitas Deep Dive: How US's MQ-9B 'Predator' Will Enhance India’s Maritime Security

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