[Retra]

Or just shoot you and cut the locks. There's nothing that is accessible to only one person.

[chii]

Put in fail deadly devices - e.g., thermite burners or bombs.

Putting in a wrong password, or excessive physical damage, will cause it to trigger, destroying the valuables.

[makapuf]

If you're alone you will make mistakes. If you're not...then you're back to trusting some people.