India’s First Underwater Metro Tunnel in Kolkata

India’s First Underwater Metro Tunnel in Kolkata mind map
  Recent News:
    Inauguration:
      By: Prime Minister Narendra Modi
      Date: Not specified in provided information
  When:
    Expected completion: 2023
  Why:
    Decongest traffic
    Transform lives near Hooghly river
  What
    Length of corridor: 16.6 km
    Underwater stretch: 520 meters
    Depth below riverbed: 33 meters
    Depth below surface: 13 meters
    Construction cost: Rs 8,600 crore
    Features:
      1.4m-wide concrete rings
      Hydrophilic gaskets to prevent water ingress
    Stations:
      - Esplanade
      - Mahakaran
      - Howrah
      - Howrah Maidan
    Travel time reduction:
      Sector V to Howrah
      Howrah to Sealdah: 40 minutes (from 1.5 hours)
  Where:
    Under Hooghly river
    Connecting:
      Howrah and Kolkata
      IT hub of Salt Lake Sector V to Howrah Maidan
  Who:
    Kolkata Metro Rail Corporation (KMRC)
    Site Supervisor: Mithun Ghosh
  How:
    Twin tunnel over 500 meters
    Tunnel boring:
      Timeline:
        First tunnel: May end or first week of June 2017
        Second tunnel: July end 2017
      Restrictions: Only one tunnel boring machine operational at a time
  Significance:
    First of its kind in India
    Expected to be at par with Eurostar (London to Paris)
    Helps reduce travel time
    Aids in traffic decongestion
  Challenges:
    Technical challenges:
      Underwater construction complexities
      Evacuation passages for emergencies
  Way Forward:
    Not specified in provided information

The Kolkata Metro Rail Corporation is set to complete India’s first underwater metro tunnel, connecting the East and West metro corridors under the Hooghly river between Howrah and Kolkata. This 520-meter stretch, part of a 16.6 km east-west corridor, is designed to significantly reduce travel time and decongest traffic in the area. The project, costing Rs 8,600 crore, includes safety features like walkways for emergency evacuation and is built 33 meters below the riverbed. The underwater tunnel will connect the IT hub of Salt Lake Sector V to Howrah Maidan, crossing the river. With stations at Esplanade, Mahakaran, Howrah, and Howrah Maidan, the metro aims to transform transportation in Kolkata, making it akin to international standards similar to the Eurostar connection between London and Paris​​​​​​.

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