The deep web contains over 500 times more information than is accessible to typical internet search engines.
At that time, the surface web was approximately 167 terabytes, whereas the deep web was 91,000 terabytes.
I think you are referring to what's called the deep web, which is much larger than the surface web, where information is available for searching.
The group's works are accessible via a hidden services site on the deep web.
Early estimates suggested that the deep web is 4,000 to 5,000 times larger than the surface web.
The intention is also to allow easier searching of the deep web.
These resources are typically deep web (or invisible web) resources since they frequently can not be located by search engine crawlers.
It provides simultaneous access to deep web scientific databases, which are typically not searchable by commercial search engines.
