Oh deja vu! I started a thread like this when our first sling did that. You worry when you smell a smelly smell that smells smelly. If you don't then assume it is okay. We have slings that burrow down for months at a time and even spend the entire late fall to early spring burrowed down. They have all emerged unscathed and beautifully molted. Don't dig it up either, let it have its alone time!