The real secrete is that indians think that screen doors should be used on submarines. Didn't they damn near sink one a year or two ago because they launched it and started to submerge but had not secured the bulkhead? Another version of DEI = Didn't Earn It. Archive: https://archive.today/ud9JE From the post: >>India is moving to strengthen its navy with a new generation of submarines designed in Germany and to be built in India. The deal, worth around $8 billion (€7 billion), is expected to be signed this summer, according to the German Defense Minister Boris Pistorius. The deal comes as the Indo‑Pacific turns into an increasingly contested arena, with submarines playing a central role. China's growing naval reach and Pakistan's deepening military ties with Beijing are sharpening India's sense of urgency.