The Thing on Level 7

The Thing on Level 7 is the only inhabitant of the Pool Rooms. "The Pool Rooms are Similar to Level 0, in the way that it is a huge vast space with only the sound of water echoing off of the white tiled walls surrounding everywhere you look. The neck-high water certainly makes it hard to concentrate on your surroundings, you are lucky if you find a small platform in the middle of the water, that allows you to rest for a few minutes. Just watch out for tsunamis that may happen every once in a while. But tsunamis should really be the least of your worries while you're here."

The Thing on Level 7 is also known as the Pool Rooms Creature and appears to be an eel-like creature that will chase you on sight. Most likely,  if it sees you, you are dead. It can swim incredibly fast and can sense water ripples from miles away. The only possible way to repel it away, would be to put something in the water, such as another substance.