SOURCE: IDRW.ORG
India has quietly achieved another significant milestone in its strategic defense capabilities by launching its fourth nuclear-powered ballistic missile submarine (SSBN), codenamed S4 (Star), according to a recent report from Hindustan Times. The submarine was launched on October 16, 2024, a day after Defence Minister Rajnath Singh inaugurated the Very Low-Frequency (VLF) Naval Station, underscoring India’s growing naval prowess.
The S4 (Star) is a sister ship of INS Aridhaman (S4), part of India’s second generation of SSBNs, designed to improve upon the capabilities of the Arihant-class submarines. With a displacement of approximately 7,000 tons, S4 (Star) is 1,000 tons heavier than the earlier Arihant-class submarines, offering more space for enhanced capabilities, including a larger missile payload.
Often referred to as the next-gen SSBNs, the S4 class submarines incorporate nearly 75% indigenous content, making them a significant leap in self-reliance for India’s defense manufacturing sector. These submarines are designed with an advanced 83MW Pressurized Water Reactor (PWR), providing them with greater endurance and operational flexibility compared to their predecessors.
The increased displacement of S4 (Star) allows it to carry more SLBMs than the Arihant-class submarines. While the specifics of its missile capacity remain classified, it is expected to carry up to 12 K-15 SLBMs or 4 longer-range K-4 missiles, providing India with a more robust deterrent. These missiles can strike targets deep within an adversary’s territory, adding to India’s strategic depth.
While the launch of S4 (Star) has been carried out quietly, the strategic impact of this development is significant. India’s SSBN program, which began with the launch of INS Arihant, has steadily progressed, and the launch of S4 (Star) marks the continuation of this upward trajectory. The silent approach to this launch underscores India’s commitment to enhancing its underwater nuclear deterrent without drawing unnecessary international attention.
With the launch of S4 (Star), India now has four operational SSBNs, with plans for further expansion of its nuclear submarine fleet. The next step in the SSBN program will likely involve the commissioning of the S4 and S4 (Star) into active service, followed by the development of even larger and more advanced SSBNs, such as the future S5 class.
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