This is another sewer mission, and it begins as soon as Dinner with Sasha is finished. Once you get past the Dust Men at the tunnel exit, make a run for your objective marker. Don't worry about the Dust Men; you don't have the power to deal with them right now. Just run for the waypoint and step into the blue circle to enter the sewers.
Battle the Dust Men[edit]
Again, your initial run to the transformer is unopposed, though you will have a little trickier platforming to get there. The power you learn for re-energizing the transformer is Static Thrusters. Static Thrusters allows you to glide (not really fly) over short distances – in the air, press and hold 
to glide slowly down. No energy is consumed by Static Thrusters.
Obviously, you'll have to use your Thrusters frequently to get through the platforming beyond the transformer. After a couple of glides from bridge to bridge, is a wall that has to be blown up with a Shock Grenade. Stand on the bridge right before the platform to toss your grenade and be prepared to take fire from the Dust Men just beyond. Jump over to the platform and use the doorway as cover to take out the mobs.
You'll have to advance cautiously, as the Dust Men like to get down in the water and shoot up at you. You can electrify the water and take them down in bunches. A couple of platforms past this first group are some Dust Men with shields. Get rid of the front line, advance a platform or two and use Precision on the shielded Dust Men.
Platforming your way out[edit]
Once past these guys, you have some free platforming for a bit. Jump and glide to the next few bridges until you reach a high wall. Get a good running jump and glide to the column below you. You're not going to quite make it, so aim for the ladder and grab it to avoid the water. If you do hit the water, quickly jump to the ladder and climb up. If you've taken damage, take a breather on top of the column to heal up.
Now you need to glide down to the platform with the fire. Again, you probably won't quite make it, but jump quickly out of the water. Glide to the next doorway and get a whiff of electricity from the fuse box.
The next room has a bit of pole jumping, and then you'll reach another high wall. There are three Dust Men below, one with an RPG. Take them out from on high and then glide down. Jump and glide to the next room and get up on the pipe before gliding to the swing arm.
Glide from the swing arm to the ladder on the column and climb up to the ring. Walk around to the other side of the column and climb the second ladder to the top. Get a running start and glide to the next column and climb it to the top. If you miss the ring and fall in the water, there's a ladder on the back side of the column – if you can swim fast enough.
Next is a tricky bit where you have to glide to two swing arms, one after the other. Once you've reached the next bridge, you're home free. Charge up the substation and exit into the Warren. You'll get a call from Zeke and one from Trish that set up your next two story missions. The call from Trish sets up An Old Friend and that will open the way back to the Neon. You'll also see a few side missions crop up – doing some of those will take some of the heat off you as the Dust Men are thick as fleas around here.