Dark Abyssal Bottom

The Dark Abyssal Bottom is the bottom of the world, with nothing underneath it. It is completely indestructible, and when the player attempts to destroy it, Oxygen is placed in the inventory. This is most likely a bug. It is intended that in the future it will be replaced with a liquid called Planetary Core, which would also be indestructible and will kill the player on contact, making deep mining a little more treacherous. In Sand² Alpha 0.4.2, the bottom near the spawn point may look like "a mess of rainbows."