[Wdll]

I have to say my knowledge of sewer combat in history is very limited.
Gaming wise there are very few games that have it.
There are first person shooters which for a while they almost always had it, or at least it felt that way. But that was mostly in the late 90s to early 00s. There are RPGs (as in role playing games) which had/have it. But strategy/wargame games...The closest thing is the underground levels in the Age of Wonders series, Master of Magic and other similar strategy games with rpg elements, all in the fantasy setting. Usually it's more like dungeons but...yeah.
I do remember of another game, non fantasy, having it but for the life of me right now I can't remember (heh) which one.