Minecraft wiki entry for Ancient_Debris, associated text: Using a diamond pickaxe with at least Efficiency II, the player can instantly mine the netherrack. With the proper angle, this makes it possible to mine while maintaining sprint. The player can then go in one direction until they hit lava, and proceed to mine in another direction. However, it is highly recommended to have multiple potions of fire resistance, as it is possible for the player to accidentally run directly into lava. Compared to using beds or TNT, traditional mining is very resource-efficient, as only tools and food are strictly needed. This method allows you to go about 12 blocks per second.