locl th key in the safe
then lock that safe in th safe
then locl that safe in a vault
then lock that vault in the ground
then expload the world

^ lock it in a safe, then lock that safe into a bigger safe, then lock that safe into an even bigger safe, then lock that safe away in a vault, then lock the vault in a bigger vault, then lock it in another vault, and lock that vault into yet another vault

it's the world's hardest russian nesting dolls to infiltrate