You have to open both doors at the same time. I had been there, opened one door at a time, and flipped both levers. I finally came back because I had runout of options. Got one of the glowstones back (from the original entrance passage to the rotater) - opened both doors - twiddled both levers, ran back and forth twice more doing that, and eventually found the passageway. It opens parallel and between the passages - you jump to it from the center of the staircase (ie before you could just jump down to the water.
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