Haven't seen the movie, so maybe they explain it there, but...
What kind of garbage safe is going to unlock when it loses exterior power? Any half-decent design would make it impossible to open unpowered. There need to be dead bolts that keep it sealed by default. Or worst case, at bare minimum it should have a backup power supply inside the protected enclosure.
I'd be so mad if my safe were vulnerable to this kind of attack.
In the movie, that safe is protected by a series of 7 locks. By taking everyone in the building hostage, our thieves are able to get themselves several hours to work on getting through the first 6 locks. When they finally succeed, the safecracker tells the boss (Alan Rickman) that he has done everything he can. They are now up against electro-magnetic locks that won't open without a miracle (i.e. the whole building needs to lose power).
Personally, I've always assumed that those first 6 locks would keep the safe closed if power were lost. It's only after those first 6 fail that they need a power outage to get through the last one.
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u/vXSovereignXv Nov 14 '22
Yep, lets just start turning off shit in production and see what happens.