
The real kicker? It IS the best outcome, in the sense that it's the only one the Foundation has observed where humanity survives the first century of the 2000's. Of all the possible futures the Foundation has encountered, this is the best outcome.

What happens in scenario XN? In 2349, an asteroid hits the Earth, wiping out most of humanity and rendering the planet uninhabitable. There's a memo explaining that the Foundation is using all its resources to try to keep the timeline on-course for a particular future designated XN. The method used is pretty horrific in itself (only brain and nervous tissue survives time travel intact, so travellers must be 'prepared' suitably) but that's not the scary part.

The scary part is it has already been pressed who knows how many times.

Essentially, it is a huge facility capable of cloning the entirety of the human race in the event of an end-of-the-world scenario, able to set the culture and civilization of mankind to any time period chosen, with politically important figures copied exactly to get the world running back on track. Then you see its classification: Thaumiel.

Right from the get go, you know this is something big when you see they've got a cognitohazard safeguard, just like the SCP-001 page.
