> For instance, #3 blinding lights, is easily mitigated by #2 non-ambient/thermal vision. No, because you need to use your susceptible-to-blinding eyes to use

> For instance, #3 blinding lights, is easily mitigated by #2 non-ambient/thermal vision. No, because you need to use your susceptible-to-blinding eyes to use the thermal-vision system. Also, of course, the fact that I have blinding & thermal-vision systems doesn't mean that my foe does. > #4, sound weapons are going to effect everyone in the tunnel, so offense is limited. That's true in general of acoustic weapons. Presumably if they can be made directional above-ground they might be made directional below-ground — or they could be treated as acoustic 'grenades,' in that they are deployed prior to ingress. > #10 foam grenades, are less effective for concealment, and ineffective as cover, most outgas toxic and flamable vocs. Existing procedure of collapsing tunnel has neither downside and accomplished with existing, legacy, and improvised tech. A small amount of slightly-carcinogenic gas beats getting shot. Sealing off a tunnel connected to the one I'm in seems far preferable to collapsing it and possibly my own. It also could make rescuing civilians who've taken shelter in the tunnel system more possible. > I won't even touch on headlamps, and insisting on an actual live canary. I'd trust an actual live animal a lot more than I would some lowest-bidder system.