The deterioration of technology is a classic and effective theme. When the tools you rely on for survival and sanity start to fail, betray you, or turn against you. The lights flicker, the life support groans, the computer displays gibberish. It's a loss of control that feels particularly modern. Our dependence on tech makes this flavor of horror resonate deeply. The novel makes you feel every system failure in your gut.
Not a book, but the SCP Foundation wiki is a treasure trove of this specific blend. So many entries are about anomalous objects or entities that are a fusion of advanced, incomprehensible tech and cosmic horror. SCP-2718 (What Happens After) is a terrifying philosophical concept about the afterlife, presented as a memetic hazard discovered through experimental tech. SCP-3000 (Anantashesha) is a massive, reality-altering eel in the Indian Ocean that feeds on memories, studied with deep-sea submersibles and D-class personnel.
The format—cold, clinical containment reports—combined with the utterly bizarre and cosmic nature of the anomalies creates a unique dread. The 'technology' is the Foundation's own procedures and attempts to understand, which always fall short. It's a bottomless pit of stories that perfectly marry the two ideas.