Tapping the ‘deep Web’
When you do a simple Web search on a topic, the results that pop up aren’t the whole story. The Internet contains a vast trove of information – sometimes called the “deep Web” – that isn’t indexed by search engines: information that would be useful for tracking criminals, terrorist activities, sex trafficking and the spread of diseases. Scientists could also use it to search for images and data from spacecraft. The Defence Advanced Research Projects Agency (DARPA) has been developing tools as part of its Memex program that access and catalogue this mysterious online world.