Berkeley was an engineer on-board the Aurora. Berkeley managed to escape in Lifepod 2 with his friend CTO Yu. He was not with Yu when she reached the Floating Island, it can be assumed he died on the journey and Yu was forced to abandon him.
Prior to the crash of the Aurora, Berkeley and Yu were testing a new drone, and Berkeley asks the drone to retrieve a Propulsion Cannon for him, but the drone retrieves a Repulsion Cannon instead. Berkeley tells the drone to get him a Propulsion Cannon, and Yu tells him that she's changed its programming and it's like him now; it doesn't like being told what to do. Berkeley begins to try again, but Yu says that the drone's name is Albert now. He calmly and politely asks the newly named Albert for a Propulsion Cannon, which the drone retrieves for him. He then tells the drone to go away, and remarks to Yu that her hobby isn't making his job any easier or safer.
After escaping with Yu, he asks her what they need to do, and Yu responds that they need to get a distress call, gear, and make it to the surface. However, Berkeley does not appear with Yu after she gets to the Floating Island, and it can be presumed that he was either killed, or Yu left him.
Berkeley and Yu have a very positive relationship, and appear to be close. Despite Yu having a higher position than Berkeley, she treats him as an equal and often teases him. It is possible that the PDA detailing her birthday was written by Berkeley.
The two manage to get into a Lifepod together, although whether this was due to convenience or they happened to be together is unknown.
Relevant Data Downloads
Lifepod 2 Chief Technical Officer Yu's Voicelog (T+2min)
CTO YU: Flotation devices failed!
Aurora Engineering Drone - Log
[Exiting sleep mode. Loading voice recognition. Engineer Berkeley and Chief Technology Officer Yu identified.]