The six-thousand-ton INS Arihant sank in 2017 and remained out of service at the docks while the water was pumped out, and the pipes replaced. The entire process took ten months. Imagine not only not having the sea sense to seal your boat before diving but having no systems in place to either warn you or lock out the attempt.

https://nationalinterest.org/blog/buzz/how-sink-3-billion-dollar-nuclear-submarine-leave-hatch-open-208170

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