[9] The ship launched variant of Varunastra torpedo was formally inducted in the Indian navy by defence minister Manohar Parrikar on 26 June 2016.

[13] This torpedo is powered by an electric propulsion system with multiple 250 kW (340 hp) Silver Oxide-Zinc (AgOZn) batteries.

[14] It can achieve speeds in excess of 40 kn (74 km/h; 46 mph), weighs around 1.5 tonnes and can carry 250 kg (550 lb) of conventional warhead.

It also has an advanced autonomous guidance algorithms with low drift navigational aids, insensitive warhead which can operate in various combat scenarios.

[2] In May 2014 it was reported that the Indian Navy is scheduled to carry out User Evaluation Trials (UETs) during the mid-year period.

In September 2015, MoD granted final approval for the torpedo's User Evaluation Trials (UETs) and eventually it was accepted for induction into Services.

[30][31] On 30 December 2024, the Indian Ministry of Defence (MoD) signed a contract, worth ₹877 crore (US$100 million), with the French Naval Group to integrate DRDO developed Electronic Heavy Weight Torpedo Takshak (EHWT) on Kalvari-Class submarines.