Central reported that there was a subject seen walking into the Transbay-Tube from the Embarcadero Station. This was confirmed by surveillance video that showed the suspect walking back and forth between trackways via the gallery doors. A sergeant and Officers from Zone 1 set up a Transbay Tube search of the trackways and gallery while a second sergeant and Zone 4 officers staged at Embarcadero. At one point, the suspect walked back to the Embarcadero Station and he was taken into custody without incident. As a precaution, inspections were performed of both trackways as well as the gallery. The suspect was arrested on a citation for trespassing and providing a false name. TSOC was notified.