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The ''Arihant'' class (Sanskrit, for ''Killer of Enemies'') is a class of nuclear-powered ballistic missile submarines being built for the Indian Navy. The lead vessel of the class, , was first launched in 2009 and began sea trials in December 2014. They were developed under the US$2.9 billion ''Advanced Technology Vessel'' (ATV) project to design and build nuclear-powered submarines. is the first ballistic missile submarine to have been built by a country other than one of the five permanent members of the United Nations Security Council. == Description == The ''Arihant''-class submarines are nuclear powered ballistic missile submarines. They are being built under the US$2.9 billion ''Advanced Technology Vessel'' (ATV) project to design and build nuclear-powered submarines. They will be the first nuclear submarines designed and built by India. The ''Arihant''-class submarines will have a length of overall, a beam of and a Draught of . They displace and have a diving depth of . The complement is about 95, including officers and sailors.〔 The boats will have one seven blade propeller powered by an pressurised water reactor. They can achieve a maximum speed of when surfaced and when submerged.〔 The submarines have four launch tubes in their hump. They can carry up to 12 K-15 Sagarika missiles with one warhead each (with a range of ), or 4 of the K-4 missiles (with a range of ). The ''Arihant''-class submarines are reported to be similar to the of Russia. The Indian Navy will have the opportunity to train on , an ''Akula''-class submarine, which the Indian Navy leased from Russia in 2012.〔(【引用サイトリンク】title=Arihant – Advanced Technology Vessel (ATV) )〕 The lead boat of the class, INS ''Arihant'' is fitted with a combination of two sonar systems – USHUS and Panchendriya. USHUS is a state-of-the-art sonar meant for Kilo-class submarines. Panchendriya is a unified submarine sonar and tactical control system, which includes all types of sonar (passive, surveillance, ranging, intercept and active). It also features an underwater communications system. The hull features twin flank-array sonars and Rafael broadband expendable anti-torpedo countermeasures. The UPA government's report card carried an image of the lead vessel, which provided the first public glimpse of the completed submarine.〔(【引用サイトリンク】title=INS Arihant image )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Arihant-class submarine」の詳細全文を読む スポンサード リンク
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