A hatch left open on the INS Arihant lead to saltwater flooding the propulsion area, rendering the $2.9 billion submarine inoperative.
The incident was first reported by The Hindu. According to an Indian Navy source, a hatch was left open allowing seawater to rush in. The Arihant issue rose soon after INS Chakra, the Nerpa class nuclear submarine leased from Russia, was reported to have suffered damage to its sonar domes while entering the Visakhapatnam harbour in early October.
INS Arihant is to be the first of the expected five in the class of submarines designed and constructed as a part of the Indian Navy’s secretive Advanced Technology Vessel project. The Arihant class submarines are reported to be based on the Akula class submarine.
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