The further into the "casino" they moved, the more uneasy Mason became simply because he had no idea what to anticipate next. Whatever it was he had imagined for this expedition this was certainly not; he was decidedly not signing up for anything like this ever again.

As they came to another fork in the tunnel, his instincts told him to go back upwards, but the sound of voices down the other tunnel made him question if they'd found another group. "Suppose that's another group?" He edged toward the tunnel on the right and listened, but couldn't quite make anything else out. "What if they need help?"  Or what if it was a trap?