Military Sci-Fi Story for Sleep

Inside the subsurface mining galleries of a fractured, freezing moon, the 3rd Section of the 77th Expeditionary Engineer Battalion descends through unstable rock, dead machinery, ammonia-argon atmosphere, and broken corporate maps. Their mission is to carry a data core to the lower relay chamber and transmit a warning before the buried threat spreads farther.
The threat below is the Choir: a distributed biofilm intelligence that converts biomass into military infrastructure, absorbs tactical knowledge from consumed hosts, and uses dead soldiers as active signal relays. As the engineers scan walls, cut through locks, patch failing suits, and force their way through service drifts, the organism learns their tools, their formations, and their frequencies.
This is "The Singing Deep" by Sascha Schmidt

Pressure Vault Seven is a failing deep-ocean reactor vault, its flooded corridors holding back thirty-one atmospheres of ocean pressure. When Pump Gallery Three loses pressure and a primary lock jams, a punishment-detail squad is sent below to restore reactor cooling before the geothermal tap overheats.
The squad crosses drowned corridors, balances across corroded gantries, and cuts through fused locks with a damaged plasma torch. But Fortress Bulls have already turned the lower levels into territory, battering walls, excavating brood chambers, scraping support pillars, and moving through human architecture like it was soft ground.
They do not hunt the soldiers. They simply do not care that the soldiers are there.
This is "Caught Between Hammer and Anvil" by Sascha Schmidt

Ash Gate Seven is a contaminated orbital fuel refinery, still running on automated pumps, pressure cycles, and active pipe galleries. A squad enters the abandoned structure while renegades hold parts of the refinery and the Choir contamination has reached the interior. Their mission is to reach the central compression spine, cross the pipe gallery, and retrieve operational logs from a hardened data vault.
Inside the refinery, the Choir does not simply infect bodies. It converts them into sensors, lures, and biological control nodes fused to valves, comms panels, pressure regulators, and power conduits. When the squad moves through the service corridor, the dead begin using familiar voices to make them stop.
This is "The Lure Dead" by Sascha Schmidt

Pressure Vault Seven is a quarantined cylinder station with a flooded algae basin, failing pumps, and corridors narrowed by alien-grown ribs. A six-person military rescue squad enters to revive seventeen hibernating colonists and extract them through Axial Maintenance Corridor 4 before the station tears itself apart.
The Ribbers do not just hunt bodies. They track fear-metabolites, feed through suit seals, and reshape the station into living infestation structure, while something inside the shared hibernation dream keeps the colonists alive as a renewable terror supply.
This is "The Fear Engine" by Sascha Schmidt

Inside Iron Vault Seven, a frozen zero-G cryogenic vault, Cryogenic Storage Unit Gamma-9 holds the Terran honeybee queens needed to restart a starving colony’s food chain. Gunnery Sergeant Valerii Petrov leads a mixed Eurasian Coalition and Federal Marine recovery team into Radial Arm Three, where the Threaded has turned the vault’s biofilm, doors, and dead recovery teams into a living trap.
They cut through sealed routes with thermal lances and move through vacuum gaps, failing comms, and container corridors where iridescent film signals their position. Then the previous recovery team begins broadcasting its own voices as a mayday lure, using memory and hesitation as part of the kill system.
This is "The Frozen Queens" by Sascha Schmidt