I wish mine would burrow. She eats like a horse, and climbs like no other, but she's so content in her hide she never burrows. Not even a shallow groove.
She has a tight hide dug into a "hill" which she stays in on cold days (it's right near the heat lamp) and just a 1/4 log hide (wide open, not buried or even tight to the ground). I put it in as a last minute (will use to build a structure on to put a hide in) until she started living in this one 95% of the time.
She just sits in the middle. It's not dark, tight, protected, or warm, and has 2 huge openings. Just sits there loving it.
Oh well. She's happy and I can see her full body anytime I want. Good times I guess.