Void

The Void is the empty space under each map. It can be seen through gaps in the lowest layer of Bedrock.

This space is blue in colour, and will change from light to dark depending on the time of day. During the day, it will also give off light like a torch. Falling into the Void will cause the player's health to rapidly decrease, eventually killing him. After respawning, the player will have lost all held items with no way to recover them.

Items, falling Sand and Gravel, and mobs will disappear if they fall into the Void. Water and Lava will appear to flow into it, but will not actually spread and form beneath the lowest layer. This effectively prevents players from descending into the Void safely via swimming.