Is this enough to block the Crimson?

Infirain

Retinazer
Знімок екрана (32).png

The tunnel is 5 blocks tall
I can give a video where you can see it in detail if you want to help and it will be easier for you to use that
 
If it’s three blocks wide all the way around then yes. Just make sure you cover/replace the grass blocks at the top and make a short tower so that Crimson Thorns don’t grow across.
View attachment 432385
Something like this (the decorations and background walls obviously aren’t necessary).
Yes but I don't have any dirt blocks there and I didn't cover them. To replace the missing blocks I dug it 5 tiles wide
 
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