Answer:
If you break me, I do not stop working. If you touch me, I may be snared. If you lose me, nothing will matter.
Bury deep, Pile on stones, My mind will always Dig up them bones
What can be forever wound up but never annoyed?
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
What I am filled, I can point the way. When I am empty. Nothing moves me. I have two skins. One without and one within.
It can be cracked, It can be made, It can be told, it can be played. What is it?