Mostly, yeah. Deep webs are are stuff like back-ends to dynamic pages, unlinked pages, FTP's etc. Search engines don't index it for many reasons, most of them technical (waiting on a crawl of all possible query combinations of a page with a MySQL back-end would destroy anyone's will to live if all they wanted was the current time in London, England). Tor uses non-indexed servers + onion routing
but only to re-route the request using trusted peers so it's more of a Dark Web. The closest analogue to Tor would be this scene in Sneakers
where they call the NSA except the links between servers are encrypted, the route is random (even the person sending the message has no idea where it's going before it gets to where it's supposed to, called mixed cascading
) and they take other security measures but I'm not sure what they are.
My understanding of most dark webs is that they're full of drugs, equipment to make drugs, conspiracy theorists organising stuff they'll never have the gumption to actually do or CP. How delicious. No wait, the other thing; tedious. I have heard stories of hits being solicited, etc. but I'd guess they're few and far between, it's still far more effective for cartel psycho's to do things more personally.