You squeeze yourself into the cavity. Ahead of you is a dark, narrow tunnel. Grunting and groaning, you elbow your way through the passage.

As you press on, you feel the sharp, rocky walls against your body, snagging onto your clothes and scraping your flesh. Sweat pools upon the back of your neck. You hardly notice the tears running down your face, unsure if they were caused by pain or dirt getting in your eyes.