hub.zip is a release file of the Minecraft map Survival Spawn, made for Minecraft 1.7.2. It was published on February 24, 2014 and is 2.2 MB in size. For the full description, screenshots and every other version, visit the Survival Spawn map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.
