User blog comment:Unownshipper/Metallurgists Wanted: Rapture's Natural Resources/@comment-24769282-20140810040047/@comment-75.36.142.53-20140810063553

Materials include organics. A resurgance of wood/fiber based products (trees/crops) grown inside. Seamounts (volcanoes that dont go past the water surface) usually have alot of biological growth (compared to the 3000 ft depth of open ocean water they often sit in - like where Rapture is), which allows things like sea farms. Biomass can actually be processed into plastics and certainly into fertilizer (and the obvious food...)