Wikipedia
The Varunastra ( Sanskrit वरुणास्त्र) is the water weapon (a storm) according to the Indian scriptures, incepted by Varuna. In stories it is said to assume any weapon's shape, just like water. As per the Indian legends or Puranas this weapon is said to have been obtained by great warrior characters such as Arjuna, Satyaki, Dhrishtadhuymna, Dronacharya, and many other illustrious warrior characters. The scriptures says this weapon was obtained by meditating on Varuna or Shiva, and was to be used with great care and skill. The usage of weapon was not possible for any inexperienced warrior, as a slight mistake committed, and the user himself could be destroyed. Indian scriptures and epics give large insights about weapons used by proper use of mantras. Weapons were used by chanting of mantras in the manner prescribed.
Category:Weapons in Hindu mythology
The Varunastra is an Indian advanced heavyweight anti-submarine torpedo, developed by Naval Science and Technological Laboratory of the DRDO for the Indian Navy.
The ship launched variant of Varunastra torpedo was formally inducted in the Indian navy by honorable defence minister Manohar Parrikar on 26 June 2016. The minister in his speech said that the government is in favor of exporting the torpedo to friendly nations including Vietnam. With some minor modifications the submarine variant of the torpedo is to be test fired shortly. The Indian Navy plans to produce 73 of these torpedoes for its use.