Some test subjects have escaped and Tannis wants you to hunt them down. To lure them out, you’ll need to head to Moxxi’s Bar and grab the pizza off the table. Go to Bloodshot Stronghold and find the path in the sewer waters near the entrance, which lead to an area filled with Rats. Be careful of any Lab Rats here, as they are pretty strong and beefy.

In order to open the way to the area with the test subjects, you will need to hit the buzzer. Drop down and place the pizza on the table, which will cause a Rat named Lee to spawn. If you don’t kill him quick enough, he will escape and another named Dan will show up. This continues on with two more spawning (Ralph and Mick), then all of them will come out at the end if they haven’t already been killed. Once they’re all done for, you can return to Tannis to get your reward, although there is an optional enemy you can fight in the next room that has no relation to this mission.

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Hitting the switches in the correct order (left) will make Flinter spawn (right).

After defeating the Splinter Group, head into the next room to find a red chest and some switches. There are five small red lights above the chest that turn green depending on how you hit the switches. Hit them in this order to make a Rat named Flinter spawn; ground lever once, wall switch once and television twice.