The interior of the underwater tunnels Credit: Estunlar.fo . A new world first Almost two centuries on, engineers in Norway are looking to push the boundaries of construction further, with the world’s first floating underwater tunnel. Notably, the undersea tunnel will boast the world's longest undersea high-speed railway tunnel when it is completed. Well, Norway already has 1,150 traffic tunnels in use across the country, with 35 already underwater. Credit: Estunlar.fo . EXCLUSIVE: The Thames Tunnel's magnificent chamber teemed with a million visitors in the first month after it opened in 1843, but when the tunnel … Thames Tunnel was built between 1825 and 1843. In addition to that, Norway’s unstable terrain definitely won’t make the creation of bridges suitable. This is the first of two road tunnels under the Karnaphuli River, each 2.5km long and 11m in diameter. This tunnel was built was usage of horse carriage but, it was turned into railway tunnel under the Thames River. Brunel proved that underwater tunnels were possible – and the tunnel is still in use today, as part of the (ironically named) London Overground. T his is the first tunnel known to have constructed successfully underwater. The first underwater railway tunnel was 396m long and was located 23 meter under the river surface. It is 31 miles (50 km) long and consists of three tunnels: two for rail traffic and a central tunnel for services and security. 3/7 Work on the roundabout. The proposed "floating tunnel" would be the first … Credit: Estunlar.fo . Engineering Marvel: How The Country’s First Underwater Metro Tunnel For Howrah Kolkata Route Was Constructed. Incredible 200-year-old plans by Marc Brunel and his son Isambard Kingdom Brunel for the world's first underwater tunnel that stretches 1,300ft beneath the Thames sell for £200,000 The Karnaphuli River Tunnel Project reached a key milestone on 31 July 2020 with the completion of the first underwater tunnel in Bangladesh, after the Tunnel Boring Machine (TBM) broke through at the Karnaphuli River east bank working shaft. 2/7 Tunnel entrance. February 29, 2020 March 1, 2020 by Jaideep Mazumdar. Channel Tunnel, rail tunnel between England and France that runs beneath the English Channel. Unlikethe 6.7-kilometer-long Hong Kong-Zhuhai-Macao Bridge's underwater tunnel, this underwater passage would be a shield tunnel and placed deeper in the seawater, which creates multiple difficulties for the construction crew. It was Rachna who was the first to embark on the ‘ground-breaking’ journey from the western bank of the Hooghly river on 18 April 2017. 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