---QUOTATION--- getting in is easy enough from the TZ. But once you're in there then you'll be stuck 'cus the guides won't work. if there is another way out i'm not aware of it. ---END QUOTATION---
Got in and talked with Lebedev. Agreed to help him, but there's still no main mission in my PDA. I also asked Nimble about the tactical situation, and he replied that the war against the Renegades was won and the Swamps was like heaven now. Got money from the trader, and was able to buy a CS-1 suit.
Next I went to the guide, that actually took me to the Fishing Hamlet. From there I walked to the Southern Farmstead, where the guide took me to Cordon.
Instead of bothering with the machine gunner in southern Cordon, I went back to the Swamps and tried the northern exit to Cordon, but that one still didn't work so I guess one must deal with the Army. At this point I also noticed that Clear Sky's friendship had completely disappeared in my PDA and that they'd turn yellow again.
I did get the important artifacts and a few good weapons before returning to the Swamps. I also did the few side missions available that early on. Didn't buy all stashes though, this is my 5th or 6th playthrough so I've become lazy.
The guides and level changers still don't work inside the Swamps (except for that one time they let me out of the base and then into Cordon). This means that in order to upgrade the CS-1 suit (didn't have enough money before) I must take the whole way around the Swamp's Twiligt Zone on my way out, and maybe also on my way into the base. The suit cost me 22.500, BTW.