Fathom Five … a state-of-the-art oceanic research facility, suspended far below the surface. There, in the dark and the deep, a team of top-notch scientists study the ecosystems and denizens of an aquatic environment as alien as another planet. There, they also conduct illicit experiments upon hapless human subjects, with the goal of giving our species a chance to adapt to a changing world. Or, at the very least, to create mutant freaky fish-people, because, why not? Oh, the arrogance and hubris of genius! Oh, the freaky things that already dwell in the strange, hostile depths! In the cold, crushing, silent pressure of a blackness lit only by eerie bioluminescence. Things that don’t take kindly to intruders Things that are ancient, and enormous, and hungry. Things like … TRENCH MOUTH.