What happens if Google crawls an offline site?

This question just popped up and I think its interesting.
Like when BlackHatWorld went offline, Google of course tried crawling it.
What does Google do, and with all it's listings?

And especially for less trusted newer sites.

It must de-index stuff after some time, maybe it depends on the PR.

No idea, does anyone know?
Of course I mean if a server fails or something like that.

It is fairly common for websites / pages to be temporarily de-indexed due to server downtime. It is usually caused by a certain number of crawl errors in a short space of time. It's worse for high traffic sites which are crawled regularly. Google's advice in this scenario is just to wait for the site to be indexed again - not much of a consolation. It happened to me once and took forever to index everything again. All in all, over a month to recover fully. I lost income because of this, which is why reliable hosting is so important.

Thanks Micallef, understand now.

Good question and a good straight answer

Hi, if it's a whitehat website and you have a webmaster tools account in Google you can add the website url and then submit a re-inclusion request if it gets de-indexed. I have done that a few times and it works well.

Regards
MDS