NEED HELP - Digging Dog - What's Best Way To Stop?

MoparLvr, no offense taken, it's all good.
I just wanted to say the Husky is never alone. If either my wife or I are at home then there's an open door for the dogs to go in or out at their desire. If we're both not home then both dogs are outside - unless it's either stormy or too cold, then they're crated for their own good.
We tried the obedience school thing with our prior Husky. She was a 'dropout' with my wife after the first several weeks - never would do what was being taught. I took her the following weeks and she ended up getting the "most improved" award upon graduation.
She's a great dog in all other aspects, but I've never had a breed with so much 'hardheadedness'.