I bet it could be done if it was purpose built and not a big old slow one that was designed for huge car and train traffic sized tunnels.

Make it smaller for man sized tunnels, it will be much faster and cheaper. Basically drone-ified. Could really catch the Russians off guard.

It would also help reduce the chances of it being detected above ground while it’s being moved to the starting point and bleow ground when it’s digging.

Russian air defense struggles as it is I doubt they’d be fully prepared to monitor for tunnel activity.