How to live underground for 1000 years?

How could humans survive underground for centuries? People have built multiple underground facilities around the world to prepare for a catastrophe. Just to be careful they overcalculated their resource needs. However they didn't expect their surface samples to contain a new deadly disease. They decide to wait out the disease, but this takes centuries, maybe even a millennium.

How would these people live sustainable? What would they eat? How could they expand? Also what about sunlight and other problems?

• Imagine a late 21st century civilisation, about 50 years from now.

• The groups that went underground are the elite, as such they consist mainly of scientists and rich folks. Billions of dollars go into the creation of these facilities.

• Multiple hundreds of people should fit in one facillity.

• They had enough time to prepare so they might have some livestock and vegetables. Maybe they could practice some form of underground agriculture?

• The disease is vaccine proof, so "vaccine and resurface" solutions are not possible. I already have a way to keep it alive on surface so also no "wait until the disease has no host and dies out" answer works.

I just need to know how they would stay sustainable for a thousand years.

This answer seems to already solve how to get water although is this still possible with an air + waterborne disease?

posted over 7 years ago

Dirgeful Zero‭

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