There was endless water, never stopping. It was such a strange thing; when it was cheerful, it could turn into lake, rivers, and sea, yet when it was depressed, it could turn into dark abyss and tunnels. Water indicated the development of human civilization, yet at the same time, it left behind devastating scars in the development of civilization.
The water was dark, deep and without boundary! The immense pressure hurt the people's chests and lungs as if they'd been heavily hit by something. The journey was dangerous. The rugged rocks were sometimes protruding and sometimes sunken. It was dark and cold. The people in the water tunnel searched for a way in difficulty as they kicked with their limbs.
