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.
These are the new versions of the visualization of ground tiles. In the lower right corner you see shallow water, moss is in the middle and deep water is in the upper right corner. In deep water the enemies won't recognize you, so you can now use this as a hiding place.