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The Indian Navy Swimmer Delivery Vehicle (SDV) is a planned class of midget submarine for the Indian navy.[1] Under this programme the Indian Navy will acquire 2 midget submarines for use as Swimmer Delivery Vehicles. These submarines will be used for conducting underwater special operations by MARCOS.[2] Both submarines will be constructed by Hindustan Shipyard Limited. The cost of procuring the two SDVs will be around ₹2,000 crore.[1]