India has strengthened its nuclear submarine fleet with INS Aridhaman, which is mostly built using local technology. The next submarine, called S4*, will be even more advanced, with up to 90% Indian-made components. It will be quieter, harder to detect, and easier to control underwater. With support from hundreds of Indian companies, this progress shows how India is becoming more self-reliant in defense and preparing for even more powerful submarines in the future.
