New Delhi, May 7 -- To combat the fast dwindling submarine fleet strength and to address ever-evolving threats, India focuses on the acquisition of six modern submarines under P-75I. While exact requirements are not public, a more modern platform than the Kalvari Class is sought. The boats must have a very low acoustic signature, concealment from detection by anti-submarine platforms, advanced countermeasures, integration with a fuel cell-based AIP system, new generation sensors, modern weapon systems and high indigenous content. While the base of the programme was cemented back in 1999, it made little progress in the next twenty years. Finally, the Defence Acquisition Council (DAC) approved indigenous construction under the Strategic Partn...