This one requires a Library present to operate. Note the double meaning of the word, ha, ha. Anyhow. Various surgical procedures need such a specialized environment to be performed, allowing all wounded to recover extra 0.25 HP plus 1% of the soldier's Max HP daily, almost halving recovery times. This facility also houses 2 Brainers and 2 animal cages (for their subjects?). Only a single Surgery Room is allowed per Hideout.
Constructing this facility requires 3 Surgery Units.