safe : i'm looking for the best vault door which gives max security?

Answer 1

If you are investing United States dollars, U.S. government back securiies (treasury bills and treasury bonds) are considered the safest investments.

If you are investing other currency there is some additional risk (as well some potential for additional profit) due to potential changes in currency exchange rates, but these are still about as close to risk-free as you will find.

Answer 2

with a plasma torch a safe can be opened in 30 mins 1' thick

keep money in banks were its insured