My man! Great game, and immersive. Let’s not also forget Silent Service, same genre and publisher, also awesome immersion.
I’ve seen graphics mentioned lot in this thread but I feel like many of us in the pre-PC and modern console age had just as many immersive moments in games that barely had anything to look at.
I had many immersive moments in some Microprose titles, early Ultima series, Bard’s Tale and Gold Box D&D series titles. A good story or setting, like a good book, allows your mind to fill in a lot of blanks.
So graphics in modern games help immersion, but certainly aren’t the end-all of immersion.