Minecraft wiki entry for Damage, associated text: If one were to break through the bedrock barrier found at the bottom of worlds, the void can be seen. Players in the void below the Y-axis of -64‌[Bedrock Edition only] or -128‌[Java Edition only] take damage at a rate of about 4 per half-second. The player usually dies from falling in the void, even in Creative or Spectator modes,‌[Java Edition only] but the player may be saved by throwing an ender pearl before falling below the Y-axis of -64‌[Bedrock Edition only] or -128‌[Java Edition only].