How can I save my son

Hint 1 of 10:

Go to the beam chamber on level three, at the north.

Hint 2 of 10:

If you've finished the control room, a plank will come out for you.

Hint 3 of 10:

Vohaul has taken over your son's body, so you must fight him.

Hint 4 of 10:

Charge at him before he gets to you to keep from being thrown off.

Hint 5 of 10:

Eventually, when the beam comes back on, push him into it!

Hint 6 of 10:

Use the hand on the ladder to retrieve the disk.

Hint 7 of 10:

Put the disk into the control stand, and look at the controls.

Hint 8 of 10:

Upload the beam to the CPU, to empty Vohaul out.

Hint 9 of 10:

Upload the disk to the CPU, to get ready to tranfer your son back in.