Ridiculous to think that Fenn dug 15 feet - he claims to have carried the box by himself to it's resting place. At the time he hid the treasure he was 80 years old - I believe he drove to a beautiful place , North of Santa Fe -( Colorado ?) Got out of the car , placed the" box" in a back pack - and hiked a short distance - out of sight of passers by - and he hid the box within a ten minute walk from his car. This an opinion formed by looking at the facts as I understand them to be , an 80 year old man , with a 40 lb. box - by himself ! He has given that it is North of Santa Fe, above 5000 ft. elevation, and it's in the Rocky Mountains .