Not going to lie, before reading I thought it was a safe holding a cannon.If it's a 'cannon' safe, does that mean it contains a Desert Eagle or maybe a 375 H&H?
If you enjoy history like I do you'll enjoy this. https://lettersofnote.com/2010/09/16/your-products-are-stronger-than-the-atomic-bomb/
https://unrememberedhistory.com/2017/08/22/the-american-made-atomic-bomb-proof-safe/