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The Shambala Waterworks was planned level 4 for the Indiana Jones and the Infernal Machine but never made it into the game.

Here you can find some info about it: https://github.com/Jones3D-The-Infernal-Engine/Unreleased-level-Shambala-Waterworks
Thanks for the link, I didn't know about this. The Ice Boss arena certainly had a different feel from the rest of the level - now I know why.
There is ongoing effort to recreate this level. Progress is very slow though, due to lack of any resources and no level editor.