[quote=Sep]
As Ellri said he doesn't have to die from the fall. Also what if you were to make contact with one of the falling stones would you not be able to manipulate it then?Also you said you wouldn't have oxygen, leave the top of the tunnel he digs open? If you're fast enough you won't use it all up before you're back out!
[/quote]

He has to be on solid ground, it's why he can't fly around on a stone disk. 

It would be easier to move a mountain than to displace enough stone to make a tunnel. 

All of this matters little, he wouldn't run, his personality doesn't allow it...