India’s Defence Research and Development Organisation (DRDO) has successfully tested an indigenously developed fuel-cell based air-independent propulsion (AIP) system intended to be retrofitted to the Indian Navy’s six licence-built Kalvari (Scorpène)-class diesel-electric submarines (SSKs). The government’s Press Information Bureau (PIB) announced on 9 March that the successful developmental trials of the land-based AIP prototype, which […]

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