Turtles for Trophies

{username}, have you already been told that the turtles outside the Dome have been mutating uncontrollably? Trouble! They're a real kind of pests... So much effort's been made to exterminate them! These creatures hide in pipelines, feed on mushrooms and survive in places where nothing else can live.
These two plumber brothers, Marioch and Luzidj, have just set out to exterminate another brood...
But what I want to know is, what makes these turtles so resilient. It might still be caused by our effluent which carries the particles of Eden and Umoir floras...

Oh, those plumbers addicted to hallucinogenic mushrooms...

Is the problem solved? I'll get to analyzing the data... I'm afraid these turtles will soon become sentient − they're already exhibiting unusual kinds of behavior... For instance, when I've sent the previous researcher − whatever was the name of that princess of Hickut − they just dragged her off with them into their lair.
Marioch and Luzidj have been looking for her ever since, but there's the rub − their princess always ends up in another sewer!