Talk:Meltdown/@comment-26053394-20150730170828/@comment-25302371-20150730180820

http://ninjakiwi.com/forums/205-sas-zombie-assault-4-discussion/posts/55407-caving-guide

"If you see a newly generated cave-hole spawning zombies, but those zombies seem to "disappear" a second later while on the hole, that is definitely your cave-hole. If you think about it, those zombies are "falling into" the cave."