Skyrim Sewers 4 Mod
MODAdds sewer systems to Solitude, Whiterun & Windhelm and a couple of forts
Adds a sewer system to Windhelm + a hidden dungeon + some minor bug fixes and aesthetics to the Solitude sewers.
Updating from the 1.0, 2.0 or 3.0 should not require clean install or a fresh save, but is something I would highly recommend just in case to get updates kick in.
