PRT Durg Holdyn is a Tarenti who went missing some days ago. Rumor has it that he broke the lock on a door in a sub-basement of Castle Tarentum that had been kept locked for decades. Nobody seems to recall why the door had been locked, and even those who can recall the Castle's construction remain tight-lipped as to where it may lead.

A preliminary investigation beyond the door revealed forgotten catacombs. Miles and miles of damp, rough-hewn walls littered with construction materials, hydraulics, pumps, pipes, and hidden dangers long forgotten within Castle Tarentum's deepest foundations. The only sign of the wayward Protector was a datapad with a cracked screen dropped a hundred yards from the door. Analysis revealed a lengthy manifesto apparently written by the young Tarenti, chronicling his descent into the catacomb and his subsequent descent into madness.

What secrets did PRT Holdyn discover down there? What sparked his madness? What inspired him to go down there in the first place? Where is he now?

Write a story inspired by this situation. It's Halloween, so make it as dark and creepy as you can. The format, perspective and plot are up to you. Grading will take technical writing skills into account (eg. spelling, grammar) but the emphasis will be on it being an engaging, creepy, scary story. Minimum of 500 words.