Russian-Built 'Black Hole' Kilo-Class Submarine 'Exploded' and was 'Scuttled'

What You Need to Know: India's INS Sindhurakshak, a Kilo-class submarine, met a tragic end in 2013 when a fire and explosion during weapon loading killed 18 crew members in Mumbai. Despite being lauded for stealth, the submarine's history was plagued by incidents, including a battery fire in 2010 and a near-sinking during transit.

-Investigations revealed violations of Standard Operating Procedures during torpedo loading as the likely cause. Plans to salvage the submarine were abandoned, and it was scuttled in 2017.