Construction

The prison security system is very good although some prisoners have managed to escape in the past by digging tunnels under the prison.

We mentioned the seismograph in Lesson 2. Does anyone remember what it is and what it is used for?

The seismograph is a device which registers underground shakes which means it can detect if anyone is digging a tunnel. The gyro sensor in this robot will function as a vibration sensor. While seismographs draw the vibrations on paper, the robot will read them and react only if they go beyond a given threshold.