Submarines — Set 3

What is the primary purpose of the 'Ballast Tanks' in a submarine?

Which country launched the world's first nuclear-powered submarine, the USS Nautilus, in 1954?

What does the abbreviation 'SSBN' denote in naval classification?

Which device is used by a submarine to detect and locate objects underwater using sound pulses?

Which Indian shipyard is responsible for building the Scorpène-class (Kalvari-class) submarines?

What is the name of India's first nuclear-powered submarine, which was taken on lease from Russia in 1988?

Which part of the submarine acts as the 'brain', where navigation and combat decisions are made?

What is the term for a submarine's ability to remain undetected by enemy sensors?

Which gas is removed from the submarine's atmosphere using 'scrubbers' to keep the air safe for the crew?

In which state is the Indian Navy's primary submarine base, INS Katyaboman, located?