his senses grew wider as they tunneled into a swirling vortex of infrared light penetrating his eyes and suddenly it stops as he is face to face with a small doorway underneath one of the towers with a padlock on it , a trap door leading directly under the yard and outside via an underground passageway directly to the open field behind the jail once used for shipping receivables according to an old sign he envisioned in his minds eye with all of the passage way .