Abandoned Tunnels

You confidently walk towards the tower. One moment you're walking on hard metal flooring, and the next moment, you're sinking beneath the moss into water. You attempt to swim back to the surface, but the moss has covered the hole you made as you fell in, leaving you disoriented. You swim frantically, but cannot find your way out. After a few minutes, you are no longer able to swim and feel yourself sink deeper and deeper. You become another pile of bones at the bottom of a hidden lake.