Ocean World Alpha Version is an alpha file of the Minecraft map Below The Depths Official World, made for Minecraft 1.7.10. It was published on April 11, 2017 and is 49.3 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the Below The Depths Official World map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.