A Federation starbase where Spock committed himself to psychiatric care in 2257, and from which he fled accused of killing three of the staff.
Starbase 5 is a Starfleet facility referred to throughout the second season of Discovery. Troubled by visions of the Red Angel that he had first experienced as a boy, Lieutenant Spock took leave from the USS Enterprise and checked himself into the psychiatric unit there.
In the episodes Brother and Point of Light, Captain Pike and Michael Burnham learn that Spock has escaped from the starbase and stands accused of murdering three doctors. Amanda Grayson, refused access to her son's records, steals his medical file from the base and brings it to Burnham aboard Discovery.
The charge later proves to be false, part of the manipulation of Section 31's systems by the threat-assessment intelligence known as Control.