The Void is the term given to the empty space below the bedrock layer in the Overworld, Nether, and End (for the End, below the island). The Void appears at the bottom of maps, where layers of bedrock restrict access to it. Falling into the Void and the
/kill command are the only possible ways to be killed in Creative mode. 
Blocks cannot be built on the underside of the Bedrock layer, but if Gravel or Sand are placed in the bottom hole nearest the void, they will fall infinitely. Pistons don't extend if placed facing downward at Y=1 and won't extend if placed at Y=0, so blocks can't be pushed into the void. Although Water and Lava appear to flow into it, they will not actually spread and form beneath the lowest layer. This prevents players from descending into the Void safely via swimming. It also prevents extreme lag; if the liquid were to flow down infinitely the game would have to deal with the hefty amount of water/lava blocks in the game which would eventually crash.
Entering the void
Falling into the Void past Y=-64 causes the player's health to be depleted by about every half second, leading to the player's death in 2.5 seconds or less, should he or she drop. Armor does not protect you from dying in the Void, and death always occurs at Y=-199.10. After this, if the player does not press any buttons, they will usually fall until somewhere below Y=-256, with this number varying on each death. However, if health or regeneration potions or golden apples are used the death level alters only slightly. If commands are used to make the player invincible or give them infinite health, they will fall until Minecraft crashes. When you fall into the void on a server with anti flying measures, you are kicked out regardless of having a flying mod. Riding a vehicle (e.g. Minecart) into the Void will result in the player being stuck in the vehicle until he/she dies.
Entities (mobs and items, excluding the player) will fall through the Void and receive the same damage as the player ( per half second), with the exception of the Wither which appears to take tremendous damage. All entities will disappear at Y=-64. Any entity above layer Y=319 or below layer Y=-64 will be black. Chickens can be spawned in the void using eggs (however they will die at Y=-64 like all other entities) and Primed TNT can fall into the Void and explode.
Surviving the Void is not possible in the Pocket Edition. When you fly through the bedrock you die, even in creative, since the ability to fly under the world's void was reported as a bug. This has not been reported on any other editions. If one creates and activates a Nether Reactor at bedrock level the generated netherrack, the softest stone-type block in the game, will even drill through the game's hardest block, bedrock. All blocks with their bottom face touching the Void appear invisible from under, giving an effective X-ray machine, and the void itself is blue. The bedrock can also be mined in creative mode, the only other way to get to the void. It cannot be accessed in the free version, since there is no actual insta-mine. Any entities in the Void are invisible, except for smoke particles from dead things, which are black.
Entering the bottom Void is not possible in the Console Edition. The player is unable to break the bottom or top layer of bedrock, even in creative. If somehow you do manage, attempting to fall into the Void will result in you standing on it. This also happens at the y-coordinate of 511, where an invisible barrier is erected to stop you going any higher. The invisible barrier for the bottom is not present in the end. However, you can use the traditional ender pearl clipping to bypass the nether roof. If you go to the edge of the top of the nether, and throw an ender pearl down at your feet while facing the edge, you will clip the barrier. You can then move back and throw pearls at the outside nether wall. However, going low enough down will end up going to the bottom of the nether, and you cannot seem to go far down enough to throw the pearls at the bottom.
Ways of reaching the Void
- Teleport there by executing the command /tp ~ -2 ~
- Make a hole there by executing the command /fill ~1 ~ ~1 ~-1 0 ~-1 air
- Set your gamemode to Creative and dig straight down. It is possible to fly around in the top layers of the Void without taking damage.
- Plant 4 dark oak saplings underneath a dark oak tree already planted with the 4 blocks on the bottom missing. This will cut through the bedrock, and attempting to cut the tree will send you to the Void.
- In Pocket Edition, spawn a nether reactor at the lowest point it works at.
- Find a dungeon which has been generated at bedrock level. Digging through the moss stone floor will give an entrance to the void. Note that it is extremely unlikely for a dungeon to generate at that level.
- Use the first two aforementioned tips for the Overworld.
- Bring 2 or more Ender Pearls and navigate to the upper-most layer of bedrock you can find. Throw them at a steady pace upward onto the bedrock until teleporting on top of the layer of bedrock. Another way which only costs 1 Ender Pearl is to place a ladder below the upper-most layer of bedrock, and any solid block under the ladder. Throw an Ender Pearl to the ladder and hold the jump and forward button.
- Jump off the land. This will immediately drop you into the Void.
You can also dig straight down on the land. This will cause you to fall into the Void and die, since no bedrock will save you. If you make a staircase down, you can maybe make bridges in the Void, since in the End directly below the end island isn't directly where the Void starts (you still have about 10 blocks).
- If you create a superflat world without bedrock layer, you can dig down to the last layer and jump into the void.
|The Void acts and provides damage as an invisible lava sea, and making the lava only visible when entering the Void.|
|1.6||Prior to this update, things that fall into the Void would become black because there is no lighting there.|
|1.8||Void fog was added. If you are in within 16 blocks of the Void, the particle effect will be visible, along with limited visibility, as if you were on render distance tiny.|
|If using an X-Ray mod, you can see the color of the Void change from blue to black while descending. This can also be seen by a player in an ocean biome. Just before the player's head goes under the water, the horizon is seen to turn black, and as the player rises it changes back to blue.|
|Entities are now lit in the Void.|
|The Player can now reach the Void through Creative mode.|
|Previously, it was possible to find holes in the bedrock that lead into the Void. This was fixed.|
|Previously, if one was to pass the 32 million block limit (called the Far Lands), the player would no longer clip (the blocks become non-solid) and fall through to the Void, resulting in the player's eventual death. As of 1.8, at the 32 million block limit world generation becomes simpler and block physics fail.|
|1.1||11w48a||Before this update, the Void fog was in all game modes. Now, mobs and items that fall through the Void will receive the same damage as the player (2 hearts per second) and disappear, respectively, when they reach Y-64.|
|1.2.1||In maps generated prior to 1.2, it was still possible to find holes in the bedrock leading to the Void under very low-level lava pools. This was fixed, and holes in bedrock no longer exist.|
|1.8||14w34c||Removed void fog and particles.|
|TU1||The void is present in the first release of the Console Edition.|
|TU5||Removed the void by making it impossible to break the bottom/top layer of bedrock.|
|TU6||Void fog can be toggled on and off. Fog is disabled by default. Void fog is dependent on the game host's settings.|
|This section may need cleanup to comply with the style guide. Please help improve this if you can. The talk page may contain suggestions.|
- If you open a hole to the Void and block off all light sources, you can see that the Void does in fact give off light (actually, it is the blocks themselves having a light level higher than 0, not the Void emitting light, as it appears to be). However, the bottom of the bedrock on the last layer is completely black.
- When the player is at a Y coordinate above 63, the Void appears blue. When the player is at a Y coordinate below 63, the Void will change color to black.
- In a Superflat world, sitting tamed wolves falling into the void will reappear next to you, taking little damage.
- Shot arrows can stick to the bottom of the lowest level of bedrock (they are stuck on a block in the Void).
- Flaming Arrows (arrows that have gone through lava or that have been shot from a flame enchanted bow) will disappear once they enter the Void while normal arrows fired by the player do not immediately disappear.
- If you destroy bedrock in creative mode and replace it with another block, particles, such as rain, will still fall through that block.
- The Void looks similar to the sky with the Night Vision status effect but if you enter the Void with the Night Vision effect, everything turns black.
- When falling into the Void, the sky above only renders for the current chunk. This can easily be tested by falling off on a skyblock world.
- When viewed on a map, the Void is seen as the pattern used for an unexplored area. This is because there are no blocks recorded in the Void's area, just the same as if you haven't explored or recorded normal areas.
- If someone joins a server with high latency, it can look like they spawned inside the Void, as the chunks have not generated yet.
- When falling below Y=0, the second last line of the debug screen disappears entirely.
- If you give yourself both Regeneration and resistance at a level of IV or higher (Possible via hacks/mods/Commands) you will not die until the effects wear off.
- Minecraft 4k's generated world could be considered as "The end of the Void" for some players, since the sky is black and the "invisible bedrock" at the bottom of the map is black.
- You can glitch in a server; if the chunk is not loaded you can walk on The Void. When it loads, you are teleported back to the area where you jumped into it.
- The void can be found on top of the Nether, as stated before, but it only starts at Y=126, allowing you to continue building on top of the nether to y=255 or whatever the building limit is for a server.
- Falling off of the End island is the only way to reach the Void legitimately in Survival mode.
- You can survive falling into the Void by eating multiple Enchanted Golden Apples.
- The void actually isn't a huge open space. When falling into the void, you are actually falling into a sky-like place with a black box constantly around you, making it seem like the entire area is black and open. If you press F5 when falling into the void, you can see the sun/moon (depending on if its night/day) and the black box around your character. The black box goes wherever you go. This is why other players and mobs turn black when they fall into the void (because you are seeing them through the black box). The black box starts at Y=61, and the void above that is actually a huge open space. This is why when you look up when falling into the void, it looks like a huge black tunnel is above you.
- In superflat, if you modify the Desert preset by removing the lower three layers leaving only sand, you can cause the entire world to cave in upon digging past the last block.
- In superflat, there is a preset called Bottomless Pit that has no bedrock, only cobblestone. This allows players to access the void in all 4 gamemodes.