The game doesn't explicitly let you know, but there's an alternate exit that appears in the north side once you've entered back into the swamp map.
Remember when leaving the swamp area that there's a big military presence on the other side. The swamps at the beginning can be a bit of a turn off for some people, there's a machine gun that's famously weak that's been beefed up slightly in this mod, as well as some bug fixes. Sky Reclamation Project is great too for Clear Sky. Not only does it provide bug fixes, but there's an included exe that lets you modify certain settings, including lowering the head bobbing, which originally gave me nausea. Zone Reclamation Project is a must for people getting into Shadow of Chernobyl.
