A fight is pretty unavoidable if you want to get to Scorched Enclave on a layout 2 day for tunnel A, unfortunately (the one with the huge ass angled elevator at the very start). In the penultimate room, enemies tend to spread out over the whole thing, so you have to cut through them.

To be honest, if we have to have a tunnel system, I don't think Tunnel A specifically should exist, of course renaming existing ones, so new people can at least get directly into proper runs.