use devcommands +god mode+debugmode+Zbutton to fly.
when floating in the air equip pickaxt and start...keep your pinky on the control button to lower yourself...with that you can dig motes deeper than a trolls height.

I have a path to my main base and I built a small boat house and portal on the other side. I just had this vision of a stone lined canal......be still my thoughts.......

I've hit that limit myself in a few place at varying depths, I didn't build a whole channel/canal, but I dug into land to dig out a boat dock... (used flying cheat to get into the water) got everything pretty well flat and deep enough except one area just wouldn't go down any further. Then I hit it again in the same area, but several meters higher up and back a bit, further away from the sea, the land in that area just won't flatten and I can't dig it down any further.

Basically as Mr. B described above.

I hope they fix/expand that at some point. I'd like to see either some more advanced terrain tools that allow you to do more and/or be more precise, or the terrain system in general improved so we don't hit "undiggable" dirt which, by all reasoning, should be very diggable.

https://www.nexusmods.com/valheim/mods/359

A mod that allows digging deeper and raising ground higher.

Originally posted by CEO of Masturbation:

https://www.nexusmods.com/valheim/mods/359

A mod that allows digging deeper and raising ground higher.

Cool, thanks! I’d shake your hand ….but…. You understand.

Explore the area nearby. I found a narrow spot of low land not too far away from my base and dug the canal there...works like a charm and saves me lots of time.

I just did some searches and it looks like once you hit the bed rock there isn't anyway to go deeper without getting into the very arcane world of editing the wolrd file directly in a hex editor. Probably not something you really want to get into unless your a really good programmer/hacker.

So looks like your options might be 1. accept the situation and look for other options, maybe a different location the might let you dig deeper enough even if the total distance is greater. Or 2, dive into the valheim data mining forums, learn how the world map file is formated and write an editor of your own.

Sorry to be the bearer of less than joyful tidings :/

How about you pick a good location and build a nice level road across it and use the
cart. Make a portage.

The amount you can dig stays the same - so the higher you go the higher it is above sea level.

Say it was measured in blocks - you can dig 10 blocks down from where it starts.