Underwater complex.

Slasher:

• Main feature: Completely blind, but possesses phenomenal, hypersensitive hearing. Echolocation allows him to "see" a three-dimensional map of corridors based on sounds.
• Patrolling: Slowly and heavily wanders the corridors of the atrium (Room 50) and the tech sector (Room 100). Drags its claws along the walls, making an eerie scraping sound.
• Reaction to noise:
  *Walking/crawling steps - doesn't notice (if the player is far away).

• Running, coughing, opening doors, HACKING shields - instantly attract his attention.
  Upon hearing a loud noise, Slasher lets out a deafening ultrasonic scream and breaks into a mad gallop towards the source of the sound.

• Weakness: If the player manages to get into a closet or vent BEFORE the Slasher enters the room and freezes (holds his breath), the monster will sniff the air, scratch the walls with his claws and move on.

Sounds like a slasher is nearby or something like that.

• When the Slasher is close, the bot should describe: heavy, raspy breathing; the scraping of metal on metal (claws on walls); the vibration of the floor under his steps.