Kalvari Submarines

L&T has so far built more than 65 defence vessels- both in partnership and on its own- including a handful for the Indian Navy and Coast Guard, according to its website

The prime minister will unveil its plaque at the commissioning ceremony tomorrow, an official said

Kalvari had on May 27 test-fired a torpedo, with sources saying that it was the last major test

Senior Navy officials said that the new heavyweight torpedo will take some time to get finalised