Well, there is at least one more tablet piece in a hidden room. To find that room you have to open two locked rooms with Glowstones and switch the levers inside each.
Not sure if I recall where I got the second - did you find the chest which is on the beam in one of the rooms? I was swimming around for the fun of it when I accidentally stumbled across it. Never would have thought to look up there for a chest.
Hope that helps!
Wyv
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