a mysterious figure bravely descends a dimly lit staircase while being watched by a cctv camera

person walking dark staircase cctv camera surveillance shadow mysterious figure descent dimly lit security protection safety precaution privacy monitoring down steps shadowy confidential hidden secretive measure caution watchful cautious discreet vigilant ominous eerie spooky unknown lurking silent footsteps underground system invasion stairway under innermost beware watch shadowed