You can't access them by Google or by using the "Suface Web" which you and me know, you have to download some programs to access the Deep Web and have to be protected because it's not safe to browse. You can get viruses, get your ID stolen, credit card info stolen, get child pornography etc or can you in trouble with law enforcement if you don't protect yourself. TOR is the program users use to access the Deep Web, the websites start with randoms numbers instead of www, you can't access it unless you use TOR.
Silk Road is one of the Deep Web sites where you can buy drugs from marijuana to MDMA. Here is a youtube video about it:
http://www.youtube.com/watch?v=GmDN42NkkIM&feature=relatedSupposedly the Deep Web is 550 times bigger than the Surface Web which is the Web 99.9% of the internet users use.
