INS Sindhukirti (S61) (Glory of the Sea)[4] is the seventh Sindhughosh-class diesel-electric submarine of the Indian Navy.

The midlife upgrade was projected to be completed in 3 years but numerous delays postponed the submarine's return.

[7] Sindhukirti was docked at Hindustan Shipyard in June 2006 for a midlife refit which included installation of USHUS sonar and the Klub-S cruise missiles and other hull works.

It was originally planned to send her to Russia for the upgrade, like her sister ships Sindhughosh, Sindhuvir, Sindhuratna, and Sindhuvijay.

Hindustan Shipyard was selected for the refit due to political wrangling, against the wishes of the navy staff.

[13] After nine years in refit, Sindhukirti finally returned to sea on 23 May 2015 and is currently active.