Is the safe grounded?
is it an electronic lock on the safe?
is it an electronic lock on the safe?
As a guy who has worked in a Faraday cage, safes (especially your typical 12 or 14 ga. RSC type "safes") and ammo cans are not Faraday cages. If anything, it would be like being in an elevator, but they are better than nothing.
Try this... call your house or wife's phone from your cell phone then close it in the safe... the phone will still work just fine unless you live on the fringe of signal.
Do the same thing with a Faraday cage, your call will drop.
FM radios won't even work in there unless you attach the antenna to the cage wall... and then why are you in the cage?
Many people forget about this. All those "electronic lock" safes are going to be toasted during an EMP event.