India Underwater Missiles: In 2025, most news about India’s sea-based nuclear weapons focused on the successful test of the K-4 submarine missile and reports about engine tests for the K-5. But there is a much bigger plan moving quietly in the background. Information available with idrw.org shows that the Defence Research and Development Organisation is already thinking ahead. At a basic design level, work has begun on future submarine-launched missiles called K-6, K-7, and even K-8.
These future missiles are not coming anytime soon. Sources say that testing for K-6 and later systems may not begin for at least ten more years. One big reason is that these missiles will be much larger and more complex. Another reason is that the submarines meant to carry them are still being built and may take six to seven more years before joining the navy.
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Current Submarines and Their limits
India’s early nuclear submarines will mainly use the K-4 and K-5 missiles. These submarines weigh about 7,000 tonnes and are an important step for India’s underwater nuclear force. However, they are designed for medium and long range missiles, not very long intercontinental strikes.
The real change is expected with the next group of submarines, known as the S-5 class SSBNs. These boats are being designed from the start to carry much heavier and longer-range missiles like the K-6 and those that come after it. Once these submarines are active, India’s missile submarines will be able to stay far away from the coast. They can hide safely in deep waters while still being able to hit distant targets.
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K-6, K-7 and K-8
Most details about K-6, K-7 and K-8 are secret but some information has come out. The K-6 missile is expected to have a range of more than 8,000 km. It may carry fewer warheads to achieve that distance. The next missile, K-7, is believed to be even more powerful. Experts say it could reach what is often called the “gold standard” for submarine missiles.
In simple terms, the “gold standard” usually means a missile that can carry around eight warheads to about 7,600 km, or fly more than 12,000 km with fewer warheads. According to idrw.org, reaching this level is more likely with the K-7 than with the K-6. If that happens, it would be a major jump in India’s sea-based nuclear strength.
Very little is known about the K-8 cause some experts think it only exists as an idea right now. Others believe it could take 15 to 20 years to become real, if it ever does. If it is built, the K-8 could match the most advanced submarine missiles in the world and may become the longest-range sea-launched missile in Asia.
