India’s ambitious $6 billion plan to build six cutting-edge submarines has hit choppy waters, thanks to contractor complaints about testing protocols at sea. Shares of Mazagon Dock Shipbuilders and GRSE took a nosedive on Friday, slipping over 4% each. Mazagon Dock shares dipped to ₹4,741.30, while GRSE touched ₹1,701.85—both marking notable drops. On the international front, German giant ThyssenKrupp Marine Systems and Spain’s Navantia SA, both paired with Indian firms, are competing for the deal. But procedural hiccups could push timelines, leaving India’s naval expansion ambitions momentarily stalled. Despite the current sell-off, both Mazagon and GRSE remain long-term heavyweights. Mazagon has been on a dream run, delivering 132% returns over the past year and 110% year-to-date. GRSE isn’t far behind, clocking 110% in one year and 96% YTD.