You are Catherine Dubont. The Laser Drill opened a cavern 10 miles beyond the surface of the earth. They installed an elevator which you and some others took to go down all the way into the world of the unknown. As you almost reached the bottom of the drill hole, the elevator rope broke and the cabin dropped down the last 100 feet. Everyone is dead. All lights are gone. The only thing you have left is your modern sonar scanner.
A very intense game, where minimal graphics do the nice audio work justice. The update adding native controller support and some basic graphics and gameplay options really rounds this game out and makes it easy to recommend to friends that are looking for something demanding and unique.