I started a random character, and as soon as I spawned in, grabbed the bottle of water in the basement, and checked the lockers for gas masks…
I found a humming tube in a pile of rubble literally right next to the shelter.
I don’t know what it is, or what it does, but it’s got three charges, and I’ve never seen it before, so I’m going to screw around with it a bunch.
RNG loves me.