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Margee, you first have to lower the bridge and deal with what's on the other side, before you can open the "hydraulic" door. (There's one of the pools that can only be accessed after lowering the bridge.)
SPOILER.......
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To lower the bridge, you need the weakened Histachii potion (or whatever it's called). You have to make it at the lab on the 1st or 2nd level.
After you have this weakened Histachii potion, you use it to temporarily (for about a few hours) transform one of your party into a histachii so that you can pass a doorway on the 3rd level and reach the lever that will lower the bridge.
NOTE: Be fully prepared before lowering the bridge. There's a nasty fight that begins after lowering the bridge. Have the weakest member of your party take the potion.
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