Gears of War/Act Three: Belly of the Beast

Locate the Pumping Station Before Dawn
Traverse the Kryll caves here to find the pumping station before the Kryll return home at dawn.

You'll come across about half a dozen Dark Wretches that prompts Marcus to have Baird to stay back and protect Cole and the resonator. Be sure to grab the Longshot on the lower platform before continuing on.

Regroup with Baird and Gus
As you and Dom continue forward, you fall down a slippery slope. So Baird and Gus will have to find an alternate route to meet up with the squad later.

Further up the path you'll come across some Drones, Grenadiers and a Sniper. Take them out with your Longshot or Lancer.

Continue the Single-Player Walkthrough in Act 4