Check Treasure Hunter's University for good overall background. Next keep in mind that folks that hid major treasures over the centuries set out to kill you if you aren't supposed to be there.The Indiana Jones stuff is real.
Do not go alone and don't attempt to pilfer if you have no underground experience.
Bradyboy, I bout fell of the chair on that one! My brain saw it as "KGB" to start with, and I was wondering what the Russians had hidden that a detectorist would want to dig up. KFC thing cracked me up!!