I dont know, it wasnt my dragon. Just a friend on a forum who cut open his friends dead beardie...
But along with the injuries, abrasion, and impaction, some of which people still deny, what do you expect animals to do with it? Animals want to dig! Covering up under 1cm of substrate does not count! If you look at my hognose tank, youll see 8 inches of aspen filled with tunnels left and right, and she uses them daily, even preferring it over the spot under the water bowl (which she used extensively before I switched from shredded to shaved aspen, which holds a better tunnel) and the hidebox. Another bonus is that when she hides, she can hide anywhere. Any temperature, any spot, at any time.