Kolkata Current Affairs

India’s First Underwater Rail Tunnel Completed

The two organizations Afcons Transtonnelstroy and Kolkata Metro Railway Corporation Ltd (KMCRL) involved in implementing the East West Metro have completed boring the India’s first underwater tunnel under the Hooghly river to link Howrah and Kolkata.  

The length of Kolkata’s East West Metro is 16.6 km long. Out of which a length of 502 metres is under the Hooghly river. The project is built by Afcons Transtonnelstroy and implemented by KMRCL. Afcons Transtonnelstroy is an Indo-Russian joint venture. The project connects Howrah to the west and Salt lake to the east. Digging the underwater tunnel was the critical task in the project. A massive tunnel boring machine called Rachna was used for boring the underwater tunnel. The tunnel boring job was completed within in a time of one month and six days well ahead of schedule.

The East West Metro with a length of 16.6 km will have 12 stations, six of which will be underground stations. The project which was slated to be completed by 2012 got postponed many times. The final commissioning of the project is expected to be held by December 2019.


INS Kavaratti, anti-submarine warfare ship launched in Kolkata

INS Kavaratti, Indian Navy’s latest anti-submarine warfare class stealth corvette was launched on 19 May 2015 in Kolkata.

Kavaratti is the last of the four anti-submarine warfare class stealth corvettes being built for India under Project 28.

Features of INS Kavaratti

  • It weighs 3,300-tonne and has a length of 109.1 metres and measures 13.7-m at beam.
  • Propelled by four diesel engines and can reach a speed of over 25 knots. It has an endurance of more than 3,400 nautical miles.
  • It is 90 percent indigenous, thus adding feather to the cap of the domestic manufacturing for the Indian Naval forces.
  • Equipped with an X-shaped hull, full beam superstructure, inclined ship sides and an Infra-Red Signature Suppression (IRSS) system increase the stealth feature of the ship.
  • It has a Total Atmospheric Control System (TACS) making it capable fight in nuclear, chemical and biological warfare conditions.
  • Designed by the Directorate of Naval Design and built by Garden Reach Ship Builders and Engineers (GRSE) under Project-28.

Project-28: Under this project four anti-submarine warfare class stealth corvettes were to build. Kavaratti is the last of four. Others are INS Kamrota, Kadmatt and Kiltan.

INS Kamrota was delivered and commissioned in the Indian navy in 2014. INS Kadmatt and Kitan are expected to be delivered between 2015 and 2017.