Digging
Digging is a skill purchased like any other that allows you to dig holes in the ground and put or receive any items. It costs *5AP to dig with a shovel and *10AP without. There are 4 levels in a hole (ie deep holes, shallow holes etc). Each level can have **6 items, so on the last level there'd be **18 items. *You don't need to fill the hole after each level when putting items in. Anyone can put items in an already open hole with the "drop into hole" button or fill them, but can't dig new holes themselves without the digging skill. You don't need to search to find items in a hole, but rather when digging in a spot where there are items to be found you'll get a message "you dig and find 2 bottles of rum and a knife." No XP is awarded for any actions associated with digging.
*There is some controversy surrounding this statement. (I'm not entirely sure if its true or not).
** I have tested this and found that there are 4 levels. Shallow, a hole, a deep hole and a very deep hole.