Enter....the Robot!
Storyline: A mine foreman is concerned that a new robot may take his job, so he scrambles the wires in its control panel. When a cave-in occurs, the men outside contact the foreman by radio and tell him that the robot was not built to work in the mine, but as a safety measure. All he has to do to escape the collapsed tunnel is turn the robot on, but since he has sabotaged the robot's wiring, all he can do is desperately attempt to find the right connections by accident until his air gives out.
This same story, credited to Gary Friedrich, was re-used in Tower of Shadows #2 (November 1969)
Credits: