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The Russian Navy's Project 677 Lada-class submarine (Russian: Лада) is a class designed by the Russian Rubin Design Bureau. The class is also referred to as the ''Petersburg'' (or ''Sankt Peterburg'' or ''Peterburg'') class, after the lead ship. A program to develop a "fourth generation" diesel-electric submarine, it aimed to produce a highly improved version of the Project 636 with much quieter, new combat systems, and possibly air-independent propulsion. ==History== The lead ship of the class, named , was launched in October 2004 and began sea trials in November 2005. The submarine was transferred to the Russian Navy in April 2010.〔 〕 Another two vessels are under construction at the Admiralty Shipyard with plans to launch four to six submarines by 2015. The Russian Navy had set out a requirement for a total of eight Lada-class submarines. However, in November 2011 the Russian Navy decided that this class of submarines would not be accepted into service, as the lead boat had fallen far short of requirements during tests. The lead boat was retained as a test vessel to experiment with various systems, the construction of the remaining boats of the class were frozen. On 27 July 2012, the Russian Navy commander-in-chief announced the resumption of the construction of the Lada-class submarines, having undergone design changes. Indonesia had once indicated its interest in acquiring two Lada-class submarines, but the deal has fallen through due to financing issues. 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「Lada-class submarine」の詳細全文を読む スポンサード リンク
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