Doctor 8

Doctor 8 is a pre-War scientist operating the Big Empty in 2281.

Background
He has lost the ability to talk due to damage sustained to his voice module during an encounter with another visitor to the Think Tank, evidences pointing towards Father Elijah, and transmits RobCo sound waves instead. However, after passing a high Science check or a Perception check, the player seems to understand his language without altering the subtitled text.