Calculate the sheet then look at the computer for the result. 1. Ideal Cadence 15. 2. Ideal Cadence 37. 3. Ideal Cadence 8.
Once done, go to the machines near the right wall. Examine the three gauges near the pipe going up:
Click on the button of the left gauge to turn it green. Click on the 15 mark to move the slider to 15. Check the gauge. Click on the button of the middle gauge to turn it green. Click on the 37 mark to move the slider to 37. Check the gauge. Click on the button of the right gauge to turn it green. Click on the 8 mark to move the slider to 8. Check the gauge.
If done correctly, all the buttons will turn green. Go back to Firmin and talk to him about the machine. He will give you a map of the mine. Read the map. There is an arrow behind the geyser door the giant was guarding.