class submarine class sanskrit class nuclear powered missile submarines built developed billion project design build nuclear powered submarines lead vessel class ins launched extensive sea trials confirmed ready operations february missile submarine built country permanent members history december pakistani war president richard_nixon sent carrier battle group named task force led nuclear powered uss enterprise attempt india response soviet_union sent submarine armed nuclear missiles trail task force event demonstrated significance nuclear weapons missile submarines prime minister following smiling nuclear test director naval headquarters initiated technical feasibility study indigenous nuclear propulsion system project project design construct nuclear submarine took shape 1990s defence minister confirmed project initial intent project design nuclear powered fast attack submarines following nuclear tests conducted india indian pledge use project aligned design missile submarine order complete india nuclear description class submarines nuclear powered missile submarines built project nuclear submarines designed built india submarines long beam draught displacement tonnes long tons short tons diving depth complement including officers sailors boats powered single seven blade propeller powered water achieve maximum speed knots surfaced knots submerged submarines launch tubes carry missiles range missiles range submarines similar class submarine russia train ins class submarine leased russia development submarines powered water highly enriched fuel version designed built centre atomic research included metre section submarine pressure hull containing tank water control room auxiliary control room monitoring safety parameters prototype critical november declared operational september successful operation prototype years enabled production version tested facilities loading replacing fuel naval submarines established detailed engineering design implemented submarine design center facility built control systems submarine steam turbines associated systems integrated supplied lead vessel underwent long extensive process testing launch july propulsion power systems tested high pressure steam trials followed harbor acceptance trials included tests flooding ballast tanks controlled limited depths ins went critical time august december submarine set extensive sea trials ships class exact number planned submarines remains unclear according media reports submarines planned built boat class ins expected commissioned vessels expected commissioned december work second nuclear began second boat prepared sea trials ships class lead ship larger missile launch tubes carry powerful water larger follow class class planned new boats capable carrying missiles timeline
Arihant-class submarine