Technically speaking, there is nothing unhackable. I don't have a reference, but I remember a discussion, where some said:
"What if I encase my computer into solid concrete, and bury it 1 km down in the earth's crust?"
Even if you could bury it there, someone else, like a government could still expend the time, money, and resources to get to it. :)
i agree,we just have better odds...