When a user empties the first level Recycle Bin, the deleted items move to a second-level Recycle Bin, which can easily be recovered by the administrator.
The first level of the Recycle Bin is the user-level Recycle Bin which is accessible by site users. It provides a site-level view of deleted content and contains all items deleted from a particular site.
The first level Recycle Bin enables an end user to restore deleted items.
The second level of the Recycle Bin is the administrative Recycle Bin , which is accessible by site collection administrators. It provides a site collection-level view of deleted content and contains all items deleted from a particular site collection. See in figure:
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