_Lisa’s POV_
The tunnel was endless.
My hands scraped against cold stone as I crawled forward. The narrow walls were pressing so tightly against me that I could barely breathe. The beam of the flashlight trembled with every step I took. Dust filled my lungs.
Every sound echoed; the thud of my knees, the faint rush of my breath, the distant dripping of water.
Sierra, I can’t breathe, I whispered in my head.
"Keep going. Follow the air. There is wind here. It means that there is a way out."
Her voice steadied me even when my body trembled. I focused on that faint current brushing against my cheek. I moved toward it. Sometimes, I had to crawl on my stomach, pulling myself through gaps so narrow my ribs scraped the walls. My heart thundered every time I thought the tunnel might close on
