Best technique to remove ground in a tunnel? (TANE)

In your example the tunnel is running roughly parallel to the grid lines, so it's easier. In accordance with Murphy's Law they usually run at a very awkward angle like 45 degrees. Not so easy then!

Mick

Tell me about it! This is even more true when using topographical maps. The tunnels have yet to even line up on the grid, ever.
 
The most I have ever used is two, or three, 1x1 digholes, and cover up see through areas with a wall, bush, twee

Setting the topo radius to min, you can tug up and down on a single corner point of a 10m grid
 
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