Don't get Shocked by this one!!
If you are an electrician or know one that will help. Otherwise you will have to google these 4 questions in order to get the combination to the cache container. I googled these also so they work as written. Have fun.
First number..... How many phases are used in 220 volts?
Second number... How many phases are used in commercial electric?
Third number... What is the maxium number of bends in a conduit run? 90 degree bends. This number plus 4
Fourth number... How high can a circut breaker box be located? This number plus 3.