This is a sureal moment in THEPRIS6NER, as in the desert 313 finds herself confronted by a pair of glass doors with absolutely nothing behind them, save for more desert! Yet as the glass doors slide open, and 313 passes through, she finds herself in a long dark tunnel. A few moments later 313 comes running back along that tunnel, and escapes through the glass doors. What it is 313 finds at the end of that tunnel is not revealed.
Be seeing you