No, these images do not show underwater tunnel under Brahmaputra river in Assam.
Few posts shared only 1 image while others shared a collage showing 3 images. Both the images shows train track and highway road going side by side with vehicles travelling.
Few images are being shared on different platforms of social media claiming that they show the 14 km long underwater road and railway line under the Brahmaputra river in Assam. Few posts shared only 1 image while others shared a collage showing 3 images.
Both the images shows train track and highway road going side by side with vehicles travelling. The third image shows Indian Prime minister Narendra Modi waving and looking at the river.
The images have been shared with narrative in Hindi "पानी के नीचे सड़क व रेलवे लाइन,यह असम में ब्रह्मपुत्र नदी के नीचे बनी लगभग 14 किलोमीटर लंबी सुरंग बताई जाती है इसे कहते हैं नया भारत". When translated states "Underwater road and railway line, it is said to be a 14 km long tunnel built under the Brahmaputra river in Assam. It's called New India"
https://www.facebook.com/photo.php?fbid=193688979647542&set=a.117959420553832&type=3
https://www.facebook.com/photo.php?fbid=1163140717863816&set=a.111286423049256&type=3
Fact Check:
The claim is FALSE.
When observed carefully, we can see that the images show graphical representation of the rail and road tracks underwater.
Firstly, when searched for the underwater rail-cum-road tunnel project online, we found several news articles confirming that the news is indeed true and Railway Ministry and Road Transport Ministry along with the Border Road Organisation (BRO) are planning to construct the country's first underwater road-cum-rail tunnels across Brahmaputra river in Assam at an estimated cost of Rs 7,000 crore. The project will constitute of three parallel tunnels, one for the road, another for rail and the third one for emergency use.
The tunnel will take off from about 9 km upstream of the existing Kaliabhomora (Tezpur) road bridge, and it will connect Jakhlabandha railway station on the south bank and Dhaliabil railway station on the northern bank of Brahmaputra, as per the Sawarajya report.
When performed reverse image search, we found several results which show the original images posted online. An article named " The Fehmarnbelt Tunnel, another Danish connection" which shared the viral image in a website named worldhighways.com, in the year 2017.
The article talks about the Fehmarnbelt Tunnel between Denmark and Germany is both ambitious and innovative, explains Susanne Kalmar Pedersen, project director at design engineering firm Ramboll, adviser to the client Fehmarn.
The tunnel is an 18km immersed combined road and rail link connecting the Baltic Sea regions of Germany and Denmark, featuring a four-lane motorway and a double-track electrified rail line. Travel time across the sea should be cut from 45 minutes - excluding waiting time at the ferry - to around 10 minutes by car and seven minutes by train.
Another article on Fehmarnbelt Tunnel states that construction work has started on German side in January 2021 and on May 5, 2022 on the Danish side (Denmark side).
Second image:
When we performed reverse image search of the second image, we found that it was shared in few articles about Norway's first floating tunnel. An article in World Economic Forum states that to make the drive from the southern city of Kristiansand to Trondheim in the north of Norway easier, the Norwegian Public Roads Administration (NPRA) has proposed the world's first underwater floating tunnel, which would be submerged in the Norwegian Sea. No floating underwater tunnel like this has ever been built before.
https://www.weforum.org/agenda/2016/07/norway-could-build-the-worlds-first-floating-tunnel
There is another article published in The Wired, in July 2016, which talks about Norways submerged floating bridge.
https://www.wired.com/2016/07/submerged-floating-bridge-isnt-worst-idea-norways-ever/#slide-2
Therefore, the images shared as the underwater tunnel bridge under Brahmaputra river are the representative images of underwater tunnels from two different locations of the world and NOT Brahmaputra River in Assam. Therefore, the claim is FALSE.