Here you will learn after speaking with Zell that you start will twenty Reserve Steam Pressure. All right, sounds good. It will automatically use four Reserve Steam Pressure to open the door to the second level. Head down the stairs. Examine the machine at the bottom and choose to use two Reserve Steam Pressure. There's a set of controls at the bottom of the stairs, don't use them, instead check out the ones on the left and agree to use four Reserve Steam Pressure to open the door. Check out the controls here to replenish your supply up to seventeen. Leave the room and use one Reserve Steam Pressure, then head down a floor. Use one Reserve Steam Pressure here, one on the next floor and four on the floor after that.
This will get you to the final area. Save your game on the left and head down. Continue until you reach a control panel at the bottom. If you followed the instructions you will have exactly ten Reserve Steam Pressure.