Last time I did the magma lab (before this update) I geared my people with all people having a landmine, everyone having TNT, and other heavy weapons, and still got my ass kicked.
This is why I keep commenting on a zombies explosive resistance, I get they have no vital organs, but I don't think they would be able to stand up straight after stepping on a landmine or being shot by an AP RPG. They just have such an insane amount of HP to burn through, and so many of them, that I cant seem to find an efficient way of killing them before I get nommed on by infectors. I dont think they have any weakness, persay, and it takes over 8 rounds of a typical round to drop a single zombie, so its a handful. Its less a tactical issue I feel, as a DPS issue... Then again, maybe I should try using stuff like the arasaka or the nitro express?
As for avalanches, couldn't they be like an RPG round but with a small detonation of a nuclear bomb? With like a shaped charge, then depleted uranium which then jets out in molten form on impact, much like a normal RPG round, but replacing copper with much heavier uranium, and a much stronger blast : I figure that would make it pretty effective.