Chapter 153

"She's trapped in here while rescuing us." Joel squatted down, slowly putting on the oxygen mask for the unconscious person on the ground. "We need to save the instructors first. Otherwise, we won't make it out of the tomb." Even so, Fiona still refused to give the oxygen canister in her hand away. Nicole didn't argue with Fiona. Instead, she took out the only oxygen canister left in her backpack and passed it to Joel. "I have the last one here. You can use it first. I'll look for a way out." After putting down the oxygen canister, Nicole explored in other directions with the flashlight. The lack of oxygen signified that this chamber had become a sealed space after the door closed. Circling along the stone wall, Nicole discovered the tomb was designed according to ancient formations of geomancy. There was an array of corresponding doors in different directions. It was impossible to exit through the door they entered. While Nicole was looking for the exit, footsteps echoed behind