India’s metro network has expanded rapidly, with underground corridors becoming increasingly important in densely populated cities. The longest fully underground metro line is Mumbai with Metro Line 3 which is the Aqua Line. It is a 33.5 km fully underground corridor connecting Cuffe Parade and Aarey. It became fully operational in October 2025. Keep reading to know in detail.
Which Indian City Has the Longest Fully Underground Metro Line?
Mumbai has the country’s 33.5-km fully underground Metro Line 3. The corridor is officially known as Mumbai Metro Line 3. It is also called the Aqua Line. The line runs between Cuffe Parade and Aarey.
What Is Mumbai Metro Line 3?
Mumbai Metro Line 3 is a major underground rapid-transit corridor in Mumbai. It covers approximately 33.5 km. The line connects Cuffe Parade to Aarey. It passes through important commercial, residential and transport areas.
How Long Is Mumbai Metro Line 3?
The total length of the corridor is about 33.5 km. The entire route is underground. It connects southern Mumbai with the northern part of the corridor at Aarey.
Which Areas Does Mumbai Metro Line 3 Connect?
The Aqua Line passes through several important parts of Mumbai. Its stations provide access to areas including Cuffe Parade, Colaba, Churchgate, Marine Lines, Girgaon, Kalbadevi, Chhatrapati Shivaji Maharaj Terminus, Mumbai Central, Worli, Dadar, Bandra, BKC, Mumbai Airport and Aarey.
First metro system to begin operations
Kolkata has a long history of underground metro construction. Kolkata Metro became India’s first metro system to begin operations in 1984. Its Blue Line has a substantial underground section. The underground portion of the Blue Line between Dumdum and Mahanayak Uttam Kumar is about 17 km.
Which Was India’s First Underground Metro?
Kolkata Metro holds the distinction of being India’s first metro system and pioneered underground metro construction in the country. Metro services began in Kolkata in 1984.
What Is the Deepest Metro Station in India?
Howrah Metro Station in Kolkata is known for its exceptional underground depth. It is located beneath the Hooghly River area as part of the East West Metro corridor. The same corridor includes India’s first underwater metro tunnel beneath the Hooghly River.