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Code lock inside nuclear weapons

2 episodes mention this

Episodes

#5649: Who Actually Controls Europe's B61 Bombs?

The US parks B61 bombs in six allied countries — but never hands over the keys. How nuclear sharing is engineered to not require trust.

Sep 30
#5628: What a Nuclear Warhead Actually Looks Like

Real warheads aren't cinematic — they're warm, gold-plated, softball-sized pits inside floor vaults under aircraft shelters.

Sep 28