User blog comment:Unownshipper/Metallurgists Wanted: Rapture's Natural Resources/@comment-75.36.142.53-20140810062120/@comment-75.36.142.53-20140810064209

Constituents of Portland Cement arent usually found under water and neither is Iron ore, so additional post-cutoff buildings in Rapture, which can use huge amounts of material might also largely be made some melted ceramic /fused materials (prefabbed inside as high heat and ocean water is a bad situation). Fortunately most of a deep under-ocean buildings structure is based on compression forces which ceramics handle very well.