Confederacy's Nightmare (New enemy and such)

[Black Rabbit]

Can you describe the best you can where you found the other pipes?

-->one was in a roon behind a big box , the other one is in the water where you see the guy with the ring in his neck cross the bridge abouve you and the other one in the room after the jumping puzzle in the cell with the rusty lock and the grunt<-- I also found the last one so it's all cool I guess... but now I have no clue on what to do