The Citadel of R'lyeh

The Citadel of R'lyeh trivia questions

1. In what ocean does R'lyeh lie sunken according to Call of Cthulhu lore?
2. What is the primary architectural material of R'lyeh's structures?
3. Which Call of Cthulhu game features an expedition to R'lyeh as a major plot point?
4. What cosmic alignment is required for R'lyeh to rise from the ocean depths?
5. In the tabletop RPG, what SAN cost is typically associated with witnessing R'lyeh?
6. What architectural feature dominates R'lyeh's central plaza in official descriptions?
7. Which Call of Cthulhu game released in 2018 includes R'lyeh exploration mechanics?
8. What non-Euclidean property of R'lyeh affects navigation and spatial perception?
9. In Shadow of the Comet, what specific location marks the path toward R'lyeh?
10. What is the established depth of R'lyeh below the Pacific Ocean surface?