On a dead ring-shipyard around a gas giant, a platoon is sent to retrieve a sealed courier core and extract one living witness.

The enemy infects suits, drones, airflows, and soldiers, turning the shipyard into a system that collects men and wears their suits.

Vacuum, metal dust, failing suit systems, jammed comms, and zero-g movement turn the exfiltration into a slow mechanical trap.

When command suspends quarantine and orders the contaminated core delivered to the ark-station, the mission stops being containment.

This is "Exfiltration" by Sascha Schmidt