Minecraft wiki entry for Safe_home, associated text: When you extend your base, be sure that nothing fragile like torches or redstone circuits are on the floor in the area. If you strike a water source, it can wash such things away. If you are unlucky, you yourself can also be swept away (maybe into something dangerous) or drown. If you wish to be extra careful, you can place slabs around any redstone circuits you do not want to be accidentally flooded, as slabs block the flow of water.