This one a bit special: most of the boat traffic through it are meant to be ferries so it is to be commissioned and managed by Norwegian Road Authority. At the same time it's quite unique if only due to enormous cross-section and can't share many usual national design solutions for the tunnels. For instance my company was asked a quotation for a PA system for it and it's really a challenge. So it's no wonder that it's delayed so much: it requires a lot of bespoke solutions.
There are more images like [1] that are just the cheap 3d renders, with less of the photoshop butchery
https://newatlas-brightspot.s3.amazonaws.com/archive/snohett...
You can see a copy of that last image (3rd in the gallery) from 2017 at https://web.archive.org/web/20170707052808/https://www.ship-... and at https://newatlas.com/stad-ship-tunnel-interview-terje-andrea... .
A copy of the first image in the gallery is at https://dozr.com/blog/stad-ship-tunnel dated 2021.
Edit: ahhh, 2017 and 2021 were the previous two big announcements about the tunnel. See my notes at https://news.ycombinator.com/item?id=48597546 .
It correlates often enough.
> The Stad Ship Tunnel (Norwegian: Stad skipstunnel) is a planned canal and tunnel to bypass the Stad peninsula in Stad Municipality in Vestland county, Norway. The peninsula is one of the most exposed areas on the coast, without any outlying islands to protect it from the weather. The section has traditionally been one of the most dangerous along the coast of Norway.
"A plan to build a ship tunnel" (2017), at http://newatlas.com/stad-ship-tunnel-interview-terje-andreas... with 29 comments at https://news.ycombinator.com/item?id=13920841
"First ship tunnel to be built under Norwegian mountains" (2021), at https://edition.cnn.com/travel/article/norway-ship-tunnel/in... with 25 comments at https://news.ycombinator.com/item?id=26540805
See also gCaptain at https://gcaptain.com/worlds-first-ship-tunnel-to-bypass-dang... from 2017 and https://gcaptain.com/norway-gives-green-light-for-worlds-fir... from 2021.
