Modernisation of the submarine fleet is being undertaken on a progressive basis to maintain combat worthiness. The equipment/systems that have undergone/are undergoing modernization are combat system, sensors, navigation complex, communication suite and auxiliary equipment.
The first of six Scorpene class submarines being constructed at M/s Mazagon Dock Limited Mumbai under Project-75, is scheduled for delivery in June 2015 and the last (sixth) in September 2018. All six submarines are being constructed concurrently.
This information was given by Minister of Defence Shri AK Antony in written reply to Shri T.M. Selvaganapathi in Rajya Sabha today.
Ministry of Defence, India