Searches has mixed results, since apparently a number of things have changed over time. Meridian pointed out to me in a comment on his Youtube that melee weapons only recently have affected walls/fences. Since I've been using axes or tech blades as breaching tools with good success, I'm wondering whether rippers, chainsaws, and the auto-ax are still worth lugging along? In admittedly limited testing, they do not open walls as easily. In fact, since I just got the auto-ax recently, I have never had it successfully cut a wall for me. Last night, I was even trying it in an Infested Cellar where my starting staircase was actually sealed up completely from the rest of the map. The pickax worked well, the auto-ax made a nice noise, but didn't otherwise do anything. I will admit I didn't really expect it to do anything to the dirt/stone tile, but I was curious. I was more disappointed that it didn't open up a brick wall I tried it on last weekend (as advertised in its pedia article), or even what looked like a lumber wall (side of a house). Is it just a flashy (splashy?) melee weapon, rather than an actual breaking & entering tool?
Maybe rippers are just a nice melee weapon for infiltration missions? Too bad the aqua ax wasn't a hatchet instead.