Here's my theory: these rings have some kind of special life energy. We've been calling it 'G'hi.' Using your rings gives you special G'hi-based abilities, but you can only power up these abilities by being around other people.
If you wander off alone for too long, you might not be able to use your G'hi powers, but you won't lose them. You just need to go find some people -- join a crew, mingle in Barton, whatever -- and your G'hi energy will charge back up.
I suppose when you're around other people, you must be sharing some kind of life force.
Could you do a quick lap around the sewers and give the shut-off valves a twist to make sure they're closed? If they're not sealed tight, things start overflowing and it makes an unholy mess down here.
The first valve is right inside the sewer entrance, and I'll program the quickest route on your PDA map. Just head to each valve in turn and crank it shut tightly. That's all there is to it!
Well done, [name]. Seems like you can really handle yourself out there -- pretty amazing how quick Dani whipped you into shape.
Here's the manhole key. I'm sure you noticed the ladders while you were doing your lap. Just climb up one of those, and you'll pop out right in the middle of Barton Town.
Dani and I got you a little going-away present, too: a stack of these Superchargers, which can heal you up a little when you get into a tight spot. If you're too exhausted to use a healing ring, they're your best bet.
If you run out, you can always buy more from Nicolae. He runs Back Alley Bargains in Barton Town, and he's got all sorts of useful stuff.
When you get out to Barton Town, look for a guard named Elizabeth. She's got more experience with rings than almost anyone, and she can tell you all about this weird place called the Null Chamber. You'll definitely need to know about that before you can take full advantage of your rings.
See you around, [name]! Good luck out there.
You too, Barry.
You found a new Power-up!
You climb up the long ladder and emerge into the sunshine.