Minecraft wiki entry for The_Void, associated text: There is no way to get to the void in the Overworld or the Nether (except a bug), as the bedrock includes a layer with no holes (except an error or playing LAN Server <With Cheats>). However, if a generated structure generates very low in the world, especially an igloo with a basement, it can override bedrock. However, this is extremely rare and it will probably not generate in your world unless you use a seed with one. A much easier way to get to the Void is through The End: