(watching VOY's "Bride of Chaotica!" - the 2nd of tonight's Trek holodeck-centric episodes)
At the beginning, Harry commented that the Planet X set looked familiar. Tom confirmed that sets were expensive and this one was previously used to represent Mercury.
I wonder if this was a reference to Vasquez Rocks and/or Planet Hell set (Paramount Stage 16) which contained various cave sets on Trek.
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