Previous HN postings which had comments are:

"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.