Terrain not dark underground

In a game called Hooked (I can provide file to engineers if need be) that’s in development, our builder made a cave in the hillside with an underground pond of sorts to fish in.

This is what we want the cave to look like (accomplished by lowering the global ambient):

But this is how it actually looks:

We even tried putting huge parts surrounding the cave, but that did nothing to make it darker:

I’d expect underground terrain to be dark, and I have no clue why it’s as bright as day (albeit a little washed out) in the cave. Our lighting properties are set to the default (globalshadows are enabled). Is this a bug?

Oops. It looks like somebody swapped our Ambient and OutdoorAmbient values. That was the issue.

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