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.
Sound, its all around you ... my heart beats faster, the hairs stand up on my skin ...
Look, with the new update v1.1, this just got more awesome, my frustration has gone down, my tension has gone up in that satisfying way. <3