User blog comment:MikhailMCraft/Crater on Planet 4546B/@comment-34794977-20180304075739

Maybe the rest of the Planet has died due to the Kharaa and the Crater is the only place that still has life due to the Sea Emperors efforts. If that's the case then the only Biomes on the planet are the ones in the Crater which would make their description the right one.