When you have to get to the control room when your at the greenhouses you go in the room with a little ditch of toxic water , dive into the water and there will be tunnels.
Go into the right and left ones and on one you will pop up in the water of the control room.
When you go in the other one you will find 2 mercenarys, fight them and go through the door on the right hand side and you will be at the control room.
Go to the sidedoor and you will pass on to the next level Noroks elbow.(which is really small).....!
More tricks, tips and cheats for this game are right here - Unreal Gold cheats
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