Just to clarify, not everyone who built an underground base did it to avoid the horde.
I built them and on horde night, depending on if on MP server or SP game, I went above ground to fight.
I have 90% of time had a separate horde base. On MP servers usually it was a team base where we all fought or on my SP game I would make my own little place to fight them. Sometime I would just juice up on coffee and run around bashing heads. Or even get zoms to chase me as a pack so others could take shots at them...lol fun times.
Anyway this was just to explain that all undergrounders don't do it to avoid the hordes on horde nights.
Thank you for listening...