Oh, hey, I love that. Xcept make it harder to make. But... !!!
Would permit cut-off map sectors to stay in touch, and units
to 'stealth' move around up and to behind the germans!!!!!
AWESOME IDEA

- A 'Nydus canal'

Xcept I'd make it to a house only, personally.
Tunnels would stay in place (sections) can be detectable via
mine detector

That's an AWESOME idea
