AI: There is a 99% probability it'll happen in one week.

Daryl: Is there anything I can do to stop it?

AI: Based on aggregated data and calculations, it's highly improbable that an individual person can prevent the chain reaction of coming events; however ...

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Daryl habitually prepared for travel with a pet carrier, including toys, food, and supplies, though none of that would be needed, and he left a note for no one in particular:

'Why the time chamber? Because I want to relive 'those days' before the nukes dropped!'

He entered the chamber with his dog and vanished.