^I’ve wondered about eligibility to be interred there. Spock was from an elite family, and personally renowned, but Mount Seleya hardly looked big enough to have an Ark for every Vulcan going back thousands of years.
Do average Vulcans not even bother to pass on their Katras when they die, or are there smaller Halls, and the Hall of Ancient Thought is like Arlington or Westminster Abbey? Maybe there are smaller mind-cemeteries around Vulcan, or families keep their own Katric Arks for their ancestors at home like an urn on the mantle.
That could be a premise for the Vulcan version of Bones or Cold Case, Vulcan investigators trying to find the Katric Arks of witnesses to crimes or archeological mysteries in old museums or family closets.