https://www.elitereaders.com/20-heavily-guarded-locations/
https://www.spectator.co.uk/2018/07/how-easy-is-it-to-break-into-the-bank-of-england/
http://moneysafebox.com/the-bank-of-england-gold-vault.html
https://www.usmoneyreserve.com/blog/how-much-gold-is-in-fort-knox-fun-fort-knox-facts/
https://www.usmint.gov/about/mint-tours-facilities/fort-knox
https://en.wikipedia.org/wiki/Semi-trailer_truck
https://goldprice.org/gold-price-per-kilo.html
https://www.usmint.gov/about/mint-tours-facilities/fort-knox
https://www.businessinsider.com/security-of-fort-knox-2011-7
https://www.quora.com/How-do-you-navigate-a-minefield