- As India develops its air independent propulsion (AIP) technology that enables a submarine stay underwater for longer periods, the last of the six boats being built in the country may benefit from the system.
- The AIP system being developed by the Maharashtra-based Naval Materials Research Laboratory (NMRL) is a fuel cell that replaces diesel in conventional submarines.
- The system also emits less noise, increasing its stealth – the most critical feature of a submarine.
- Developing the technology will cost India about Rs 50,000 crore ($7 billion).
- The submarines were initially to be delivered between 2012 and 2016.