Thread:Project:Support desk/Hacked page, unable to delete/reply (6)

Once the page is deleted, if you access that page, the server will return a HTTP 404 response, although you'll still see the normal MediaWiki interface to recreate it.

Search engines should not index those pages, and those pages will eventually drop from the search results. I think you can remove a page from Google results if you have a google webmasters tool account