The Arihant class submarines are nuclear-powered ballistic missile Submarines being developed for the Indian Navy. 'Arihant' is a Sanskrit word which means 'slayer of enemies' or 'destroyer of enemies'. INS arihant, the first in this class of submarines was introduced to the public on July 26, 2009 at a symbolic launch ceremony, which consisted of heating it by flooding the dry dock. However, shortly after its launch it was declared that the submarine is not complete and that key systems including its nuclear reactor, surveillance equipment, sensors, weapons, and ordinance are yet to be installed. Hence, it could not immediately join the Indian Navy.
INS Arihant, India’s first indigenously designed and built submarine, will undergo sea strials brime it formally joins the Indian Navy, which is expected by 2011. Prior to joining, the submarine will undergo Harbour Acceptance trials (HATs) in which the submarine's nuclear reactor will be 'fired' and
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