Cause him pain. Shoot him in the knee.
NIVEN SHOOTS HIM IN THE KNEE

HE SPEAKS NOW
Detain the mechanic and interrogate him about the following subjects.
-Unmapped ventilation areas
-Security office
-Droid
-Battery
-Object he was holding
-Nanotechnology specialist
-How to disable main gate
-Strength of forces/robots and their weaknessess
-Warden
HE KNOWS NOT WHERE VENTS GO
IT IS TO THE RIGHT
THE DROIDS WERE PUT OUT TO KILL ANYONE WHO BREAKS IN AFTER THEIR COMPOUND BLEW UP
HE IS REPAIRING THE BATTERY SO IT DOES NOT EXPLODE
THERE IS ONE IN THE MED BAY
GOING TO SECURITY ROOM
SHOOTING THEM/HACKING THE SECURITY CONSOLE
WHO?
afterwards,ask him about the following;
-What he was doing with the robot
-Where his boss is
-How to get to his boss
-and any secret passages
IT WAS DEFENDING HIM
DIG ROOM
GO TO DIG ROOM
NONE THAT HE KNOWS OF
WHAT WILL YOU DO WITH HIM NOW