The inner core
If you think about it for a while, we are very very small, living on the surface of a big circular shaped rock. We have been here for a fraction of the life of this ball we call home, the planet Tellus. If you start to drill, you will not even penetrate the outher most shell of the planet and the heat will destroy everything you try to put there....
The cache
Be gentle with this container, it have not done anything to you, so you should not do anything to it either. Please do not use knifes, multi tools, screw drivers etc. Use the other gear you brought or SHOULD have brought with you. Else this could take a while... ;)
Have fun!
Gur vaare pber vf gur nafjre...