First of all, let me clarify that the concept of "Marianas" and the "5, 6, 7 levels" of the deep web does not exist. I am saying this as someone who has been in the Darknet for a very long time before the silk road, and there is nothing like that. What you'll find in the DW is this: 50% CP, 40% scammers, and the remaining 10% consists of various forums, markets, Satanism, legitimate sellers, etc. (I clarify these figures are mine, there's nothing backing them up, but based on my experience, it's like this).
If you want to be "anonymous" while browsing the DW without getting involved in illegitimate sites (many of which are actually law enforcement), then all you need is: Mullvad VPN, navigating everything through Whonix within a VM, a host OS of Linux (Ubuntu or any BSD) with antivirus software and a firewall, and most importantly, do not use personal information and do not combine data from the clearnet here. Many people get caught because of their personal Gmail accounts, having the same username everywhere, or blindly trusting someone (talking about sellers, hackers, carders, forum admins, buyers...)