Assimilation chamber

An assimilation chamber was a section on a Borg vessel where the assimilation of an individual or group of individuals into the Borg Collective was performed. 

In 2376, USS Voyager crewmembers Chakotay, Tom Paris, and Neelix were held captive in an assimilation chamber of a Borg cube, by a group of adolescent drones who were the sole survivors of a deadly pathogen which had killed the rest of the Borg on the ship. 

Assimilationskammer