1. The first water diverter nearest the beginning spot: All water should be diverted to the RIGHT side.
2. Next water diverter (with the little ladder to climb up): All water should be diverted to the RIGHT. This one is trickier because you have to pull the diverter chain twice (first pull diverts it halfway, second diverts it full right).
3. Third water diverter (this is the one with the broken wheel): Nothing to do here, but it is a test to see if you got the two upstream diverter correct. This area should be DRY... no water. If it is not, then you haven't done the other two properly yet.
4. Last diverter with the Snake Lock: This snake lock needs to be unlocked, then turn the wheel once so that the fountain area behind you is flooded.
NEXT:
After you do the above, you have to use the dunking Harvester to displace and remove the water in the Harvester well to get access to the door below.
1. You have to use the controls to close the Harvester door (so it is water tight and sealed), then lower it into the pit to displace as much water as possible. Then raise it again and check to see if you can find the path down below the Harvester (look at the Harvester door then look down and search for a hot spot to go down). You may have to dunk it a second time; I can't remember.
2. If you can get down there to the stairs below the Harvester, look for a valve on the wall that opens a duct that lets more water "overflow" when you dunk the Harvester. Then return to the dunking controls above.
3. I think you have to dunk the Harvester once more with the Harvester door closed to displace water through the duct you opened below, then raise it.
4. Then, you have to open the Harvester door, and dunk it one more time with the door open. The water will fill the Harvester since the door is open. While it is still dunked, CLOSE the Harvester door to trap the water inside, then raise it and leave it raised. This should remove the last of the water. Check the stairs again and the access to the door below should now be there.